Publication 583 Summarized — Starting a Business and Keeping Records
Main points
- This publication explains a subject that many taxpayers first encounter only through forms and worksheets, making a conceptual overview essential before diving into return preparation.
- The publication works best when the reader uses it to understand the structure of the topic first, then turns to the official source for exact tests, thresholds and computations.
- Tax treatment often depends on classification, timing and the interaction of multiple rules rather than on a single intuitive idea.
- Readers usually get the most value when they begin with the sections that match their immediate problem and then expand into connected sections only after the core issue is understood.
Common Mistakes to Avoid
- Starting with return preparation before understanding the governing concepts.
- Assuming the name of a credit, deduction, entity, or filing status tells the whole tax story.
- Using old tax assumptions or internet summaries without checking current IRS guidance.
- Treating recordkeeping and timing as secondary issues even though they often control the result.
Section-by-Section Summary
Why recordkeeping is foundational to tax compliance
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers why recordkeeping is foundational to tax compliance. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, why recordkeeping is foundational to tax compliance usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
How starting a business creates immediate federal tax administration questions
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers how starting a business creates immediate federal tax administration questions. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, how starting a business creates immediate federal tax administration questions usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
Why business records and systems matter before the first return is filed
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers why business records and systems matter before the first return is filed. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, why business records and systems matter before the first return is filed usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
How startup costs differ from regular operating expenses
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers how startup costs differ from regular operating expenses. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, how startup costs differ from regular operating expenses usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
Why mixing personal and business finances creates downstream tax problems
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers why mixing personal and business finances creates downstream tax problems. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, why mixing personal and business finances creates downstream tax problems usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
How Publication 583 complements Publication 334 and Publication 538
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers how publication 583 complements publication 334 and publication 538. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, how publication 583 complements publication 334 and publication 538 usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
What practical systems a new business owner should build first
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers what practical systems a new business owner should build first. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, what practical systems a new business owner should build first usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
How readers should use the publication as a startup checklist
This section of Publication 583 Summarized — Starting a Business and Keeping Records covers how readers should use the publication as a startup checklist. The publication explains how the IRS organizes this topic and what facts the taxpayer needs to identify before the correct return treatment can be determined. Readers often start with a practical question rather than a tax-law category, and this section bridges that gap.
In practice, how readers should use the publication as a startup checklist usually affects more than one part of the return. It may change reporting, timing, eligibility, documentation, or later-year consequences. The publication spends substantial time not only naming the rule but showing how it works in context.
How to Use This Publication
Start with the section most closely connected to your immediate problem. If your question is about eligibility, read the eligibility and classification sections first. If your question is about what counts, read the income, deduction, or item-definition sections first. This publication becomes much easier to use when treated like a decision guide rather than read cover to cover.
In real tax practice, this publication is rarely the only one that matters. Practitioners often pair it with form instructions or other publications that go deeper on narrower issues.
For related context, see our guides on Schedule C, calculating business expenses, estimated tax payments.
Last updated: April 2026. This is a general summary. The official IRS publication contains complete rules, examples, thresholds, worksheets and exceptions.
Related Services from The Reed Corporation
Helpful Guides You Might Also Like
Sources & References
Frequently Asked Questions
What is IRS Publication 583 and who should read it?
Publication 583, Starting a Business and Keeping Records, is the IRS guide written for people who are setting up a new business and want to get the tax side right from day one. It is short, plain, and built for someone who has never run a business before. The two big topics it covers are the early tax decisions you have to make when you open the doors and the recordkeeping system you need to track what comes in and what goes out. If you are a freelancer taking your first 1099 client, a couple forming a partnership, or a person forming a corporation, this is the document to read before anything else.
The publication does not try to teach you every rule in the tax code. It points you toward the right decisions and the right records so that when filing season arrives you are not scrambling. Think of publication 583 starting a business and keeping records as the on-ramp to the whole tax side of your business. It tells you what structure questions to settle, whether you need an Employer Identification Number, which accounting method to pick, what tax year to use, and exactly which papers to hold on to and for how long. Each of those topics gets its own short section, and none of them assume you already know the jargon.
Why does the IRS bother publishing a guide like this for brand new owners? Because most tax problems for small businesses trace back to two early failures. The first is picking a structure without understanding which return it forces you to file. The second is keeping bad records, or no records at all, so deductions get missed and income cannot be backed up if anyone asks. Both of those are avoidable, and both are far cheaper to fix at the start than after a notice shows up in the mail two years later. The publication exists to head off both problems before they happen.
It also covers a few things people forget to think about when they are excited about a new venture. It walks through how to figure your business income and expenses, what counts as a deductible business expense, how depreciation works for the equipment you buy, and how your business taxes connect to the personal return you already file every April. None of it is deep, but all of it is the foundation you build on. Once you understand the 583 basics, the bigger IRS guides make a lot more sense.
Here is a number that makes the point. Say a new consultant earns 90,000 dollars in her first year and spends 14,000 dollars on software, travel, a home office, and contract help. If she tracked every expense in a simple log tied to a business bank account, her Schedule C shows 76,000 dollars of net profit and every deduction is easy to prove. If she kept nothing and tries to reconstruct from memory in April, she might only remember 8,000 dollars of those costs. That gap is 6,000 dollars of missed deductions, which at her bracket plus self-employment tax is real money handed back to the government for no reason. Same business, same year, two very different tax bills, and the only difference is whether she kept records.
The common mistake we see most is treating recordkeeping as something to deal with later. It never gets easier later. A receipt you cannot find in April was a deduction you cannot claim. If you are setting up a business now and want a system that holds up, our bookkeeping service builds the exact structure publication 583 describes so your books stay clean all year long. Set it up at the start and the next time you sit down to file, most of the work is already done for you.
How does my business structure affect which tax return I file?
Your business structure is the first real decision in Publication 583, Starting a Business and Keeping Records, and it drives almost everything that follows, including which return you file every single year. The IRS recognizes a handful of common forms, and each one routes to a different filing path with its own form numbers and its own rules. Pick the wrong one for your situation and you can end up paying more tax than you needed to, or filing forms that do not fit how your business actually runs day to day.
A sole proprietorship is the default when one person runs an unincorporated business. You report the income and expenses on Schedule C, which attaches to your personal Form 1040. There is no separate business return at all. This is the simplest path, it costs nothing to start, and it is where most freelancers and side businesses begin. The tradeoff is that all of the net profit is subject to self-employment tax, and there is no legal separation between you and the business. If the business is sued or runs up debt, your personal assets are on the line, because in the eyes of the law you and the business are the same thing. Many owners stay a sole proprietor for the first year while they test the idea, then move to an LLC once there is real money and real risk involved.
A partnership exists when two or more people run a business together without incorporating. The partnership files Form 1065, which is an information return, and then issues each partner a Schedule K-1 showing their share of the profit or loss. The partners report their K-1 amounts on their own 1040s. The partnership itself does not pay income tax. The income flows through to the partners, who pay tax at their personal rates. Anyone going into business with a partner should understand this flow before the first dollar comes in.
A corporation files its own return, Form 1120, and pays tax at the corporate level. If the owners then take dividends, those get taxed again on the personal side, which is the double taxation people complain about. An S corporation is a corporation or an LLC that elects to be taxed differently. It files Form 1120-S, the income flows through to the shareholders on K-1s, and it avoids the corporate-level tax entirely. S corp status can lower self-employment tax for some owners because only the salary portion is subject to it. But it is not right for every business, and it carries payroll obligations and a reasonable-salary requirement that the IRS does watch.
An LLC is the flexible one, and it confuses the most people. By default a single-member LLC is taxed like a sole proprietorship, so you still file Schedule C. A multi-member LLC defaults to partnership treatment and files Form 1065. But an LLC can elect to be taxed as an S corporation or even a C corporation instead. The legal form and the tax form are two separate things. You can be an LLC for liability purposes and an S corporation for tax purposes at the same time, and a lot of new owners never realize that until someone explains it.
Here is the practical takeaway. The structure you choose is not just a legal label. It sets your filing obligation, your tax rate path, your self-employment tax exposure, and how much paperwork you carry every year. For the full plain-language breakdown the IRS offers, Publication 334, Tax Guide for Small Business, goes deeper than 583 on the day-to-day filing rules for sole proprietors and small operators. If you are not sure which structure fits, that is a conversation worth having before you commit, because switching later can mean a new EIN and a new set of filings. Our tax strategy consulting can run the numbers on each option for your specific income picture so the choice is based on math, not a guess you regret.
Do I need an Employer Identification Number and how do I get one?
Whether you need an Employer Identification Number is one of the setup questions Publication 583, Starting a Business and Keeping Records walks you through, and the answer depends on how your business is built. An EIN is a nine-digit number the IRS uses to identify your business, the same way a Social Security number identifies a person. You apply for it on Form SS-4, Application for Employer Identification Number. The number itself never expires, and once you have it, it stays with that business entity for life.
You need an EIN if any of these apply. You have employees and run payroll. Your business is a partnership or a corporation, including an S corporation. You have a Keogh plan or certain other retirement plans. There are a few other triggers too, like withholding taxes on income paid to a nonresident or filing certain excise tax returns, but the ones above cover most new owners. A single-member LLC with no employees can often use the owner’s Social Security number instead, though many owners get an EIN anyway for reasons that have nothing to do with whether the IRS requires it.
Even when an EIN is not strictly required, getting one is usually the smart move. Banks ask for it when you open a business checking account. Clients ask for it on the W-9 you fill out before they pay you. Using an EIN instead of your Social Security number on those documents keeps your personal identifier more private, which matters when you are handing it out to every client who hires you. The fewer places your Social Security number lives, the better, and an EIN takes it off a lot of paperwork. It also makes the business feel like a real business to the people you work with, which is worth something when you are trying to land clients.
Applying is free and fast. The quickest route is the online application on the IRS website, which gives you the number immediately once you finish the short form. You can also mail or fax Form SS-4, but those take much longer, weeks by mail in some cases. Be careful with third-party sites that charge a fee to get an EIN for you. The IRS does not charge anything at all, and the online tool is simple enough that you do not need to pay anyone to do it. If a site is asking for money to get your EIN, you are on the wrong site. Have your structure decision and your responsible party information ready before you start, and the whole thing takes about ten minutes.
A common mistake new owners make is applying for an EIN too early, before they have settled on a structure. Your EIN is tied to the exact entity you describe on Form SS-4. If you apply as a sole proprietor and then form an LLC taxed as an S corporation a month later, you may need a brand new EIN for the new entity, and now you have two numbers and a mismatch to explain. Settle the structure question first, then apply once for the right entity. That order saves you from juggling numbers and from getting notices addressed to a business that no longer exists the way you set it up.
One more point worth making. Your EIN ties directly into your recordkeeping. Employment tax records, payroll filings, and your business bank account all reference it, and those records are part of the system publication 583 starting a business and keeping records tells you to maintain from day one. If payroll is anywhere in your future, our bookkeeping service keeps the employment tax records organized so the EIN side of your filings stays clean from the very first paycheck you cut.
What records should I keep and for how long?
The heart of Publication 583, Starting a Business and Keeping Records is the recordkeeping system, because that is where most new owners stumble. Good records do two jobs. They let you claim every deduction you are entitled to, and they let you back up your numbers if the IRS ever asks. Bad records cost you both ways. You miss deductions you actually earned, and you cannot defend the ones you did take. The publication treats recordkeeping as the spine of running a business, not as an afterthought, and that is the right way to see it.
Start with the categories. You want records of gross receipts, which is all the income your business brings in. You want records of purchases, meaning the things you buy to resell or to make your product. You want records of expenses, all the ordinary costs of running the business, from software to mileage to office supplies to the fee you paid a contractor. You want asset records for anything you buy that lasts more than a year, like a computer or equipment or furniture, because those get depreciated over time and you need the purchase date, the cost, and how you use them. And if you have employees, you want employment tax records covering wages, withholding, and every payroll filing.
Behind each of those categories sit the supporting documents that prove the numbers are real. Invoices you sent and invoices you received. Receipts for what you bought. Bank statements and canceled checks. Credit card statements. Mileage logs. These are what turn a line in your bookkeeping into a defensible figure on your return. A number with no document behind it is a number you might have to give back in an audit, with interest and penalties on top. The IRS does not have to take your word for a deduction, it can ask you to prove it, and the proof is the receipt.
How long do you keep all of this? The general rule is at least three years from the date you file the return, because that is the normal window the IRS has to examine it. But several items run longer than three years. Asset records stick around for as long as you own the asset plus the period after you dispose of it, because you need the cost basis to figure gain or loss on a sale and to support depreciation the whole time you held it. Employment tax records should be kept at least four years. And some records you keep indefinitely, like documents tied to property you still own or a return you never actually filed. When in doubt, the publication 583 starting a business and keeping records guidance leans toward keeping longer rather than shorter, and that is sound advice.
A worked example shows why this matters in dollars. Say you buy a 4,000 dollar laptop in year one and depreciate it over several years. If you toss the receipt after twelve months, you have lost the proof of basis you need for the deduction every single year you keep depreciating it, and the proof you need to figure the gain when you eventually sell it or trade it in. That one missing receipt can unwind several years of legitimate deductions, turning a 4,000 dollar write-off into a problem you cannot fully back up. The receipt cost you nothing to keep and a lot to lose.
The mistake that wrecks the most returns is throwing receipts away or never logging them in the first place. Reconstructing a year of spending from memory always undercounts, which means you pay tax on income you actually spent running the business. Keeping the records as you go is the only reliable fix. Our bookkeeping service captures each category in real time so your records are ready before you ever need them, instead of being a shoebox you dread opening every spring.
Why does separating business and personal money matter so much?
Publication 583, Starting a Business and Keeping Records circles back to one habit again and again, which is keeping your business money separate from your personal money. It sounds basic. It is also the single thing that makes the biggest difference between a return that practically writes itself and one that turns into a forensic project every April. A dedicated business bank account and, ideally, a separate business credit card are the foundation of the whole recordkeeping system the publication describes.
When every dollar of business income lands in one account and every business expense leaves from that same account, your records build themselves. The bank statement becomes a running ledger of the entire year. At filing time you are categorizing transactions that are already business transactions, not sifting through a personal checking account trying to remember whether that 60 dollar charge was groceries or office supplies. The separation also makes your return defensible. If the IRS asks about a deduction, you point to the business account it came from instead of explaining why a personal card has business charges scattered through twelve months of restaurant tabs and rent payments.
Picture two freelancers who both earn 80,000 dollars and both spend 12,000 dollars running their businesses. The first opens a business checking account on day one and runs every client payment and every expense through it. At year end she exports the transactions, sorts them into categories, and her Schedule C nearly fills itself in. The whole thing takes an afternoon. The second freelancer ran everything through his personal card mixed in with rent, dinners, and streaming subscriptions. He spends days untangling which charges were business, second-guesses himself on half of them, and ends up claiming 9,000 dollars instead of 12,000 because he could not be sure about the rest. He just paid tax on 3,000 dollars he actually spent on the business, purely because the money was never separated. Same income, same real expenses, a worse outcome.
That is the common mistake in its purest form, mixing personal and business spending on one card. It does not just create work, it costs deductions, because the charges you cannot confidently tie to the business are the ones you leave off the return out of caution. And if a return ever gets examined, commingled accounts invite more questions, not fewer. An auditor who sees a clean business account moves faster than one who has to wade through a personal card to find the business charges buried in it.
The separation helps with more than taxes, too. It makes your bookkeeping sane month to month, it gives you a real picture of whether the business is actually making money, and it builds a paper trail that matters if you ever apply for a loan or sell the business. A lender wants to see business activity in a business account, not a personal one. None of this requires expensive software. It requires one account and the discipline to run everything through it.
The fix is cheap and permanent. Open a business checking account, route all income and expenses through it, and put recurring business costs on a separate card. From there the recordkeeping system publication 583 starting a business and keeping records describes falls into place almost on its own. For deeper background on small business filing, the IRS offers Publication 334, Tax Guide for Small Business, which pairs well with 583. When the business income eventually flows onto your personal return, our individual tax return service ties the Schedule C into your 1040 cleanly, and clean books are exactly what make that handoff fast. Set up the separation now and every filing season after this one gets easier instead of harder.