Bookkeeping for the trades: what to keep and how to do it

Good bookkeeping for a trade business comes down to three habits: run every dollar through one dedicated business account, keep a record of every bit of money in and out with the receipt to back it up, and use the cash method of accounting so you are taxed on money you actually collected. Do those three and you have clean books, a painless tax return, and an answer for every dollar if the IRS ever asks. None of it needs an accounting degree. What sinks people is not complexity, it is letting a shoebox of crumpled receipts and a mixed-up personal account pile up until tax season becomes a nightmare and half the deductions are lost. Here is the whole thing in plain terms.‍‌‌​‌​‌‌‌‌​​​‌​​‌​‌​​​‌​​​​​​​‌‌​‍

What "keeping books" actually means

Bookkeeping is just the running record of your business money: what came in, what went out, and what for. For a solo tradesperson that is a list of every payment a customer made you and every expense you paid, each one dated, categorized, and tied to a receipt or invoice. That is it. The software or spreadsheet organizes it, but the job is the same whether you use a $0 app or a $200,000 accounting package.

You keep books for three reasons, in order of how much they cost you if you skip it:

• Deductions. Every business expense you cannot prove, you cannot deduct, so you pay tax on money you already spent on the business. Sloppy records are a straight cash cost every April.
• Knowing if you are making money. Being busy is not the same as being profitable. Books are how you find out which jobs made money and which quietly lost it.
• Surviving an audit. If the IRS questions your return, your records are your defense. No records, no defense.

Rule one: one business account, nothing personal through it

The single most important bookkeeping habit is to never mix business and personal money. Open a dedicated business checking account and a business card, run all business income into it and all business expenses out of it, and pay yourself by transferring an owner's draw to your personal account on a schedule. Do not buy groceries on the business card. Do not deposit a customer check into your personal account "just this once."

Mixing the two (called commingling) does two kinds of damage: it turns your bookkeeping into detective work, and if you have an LLC it can strip away the liability protection you formed the LLC to get. The account setup and the legal side of that are covered in full in Business banking and building credit. For bookkeeping purposes, just know this is the rule everything else rests on. A clean separate account means your bank statement is already 90 percent of your books.

What records to keep, and for how long

Keep enough to prove every number on your tax return. In practice that means:

• Income records. A copy of every invoice and every payment received, plus any 1099-NEC or 1099-K forms customers or platforms send you.
• Expense receipts. For materials, tools, fuel, subcontractors, insurance, software, licenses, and anything else you deduct. A card statement line alone is weak; keep the itemized receipt where you can. Photograph paper receipts the day you get them, because thermal receipts fade to blank.
• A mileage log. If you deduct vehicle costs, you need dated business miles with the purpose. A phone app that tracks trips is the easy way. Reconstructed-from-memory mileage is the first thing an auditor pulls apart.
• Bank and card statements for the business accounts.
• Payroll and 1099 records if you pay anyone. Copies of what you filed, and the W-9s you collected from subs before you paid them.
• Asset records. What you paid for the truck, trailer, and big tools, and when, because that drives depreciation and Section 179 (see Writing off your truck and equipment).

How long to hold them: the IRS generally has three years to audit a return, so keep records at least that long. Keep employment tax records at least four years. Keep anything tied to an asset (the truck, equipment) for as long as you own it plus three years after you sell or scrap it, because it affects the gain or loss. If you ever underreport income badly or skip a return, those windows get longer, which is one more reason to file clean. These are current federal windows for 2026; confirm at irs.gov.

Cash vs accrual: pick cash

There are two ways to record when income and expenses count, and for almost every small contractor the right one is the cash method.

• Cash method. You count income when the money actually lands and expenses when you actually pay them. Simple, and it matches your bank account, so a customer who has not paid you yet is not income you owe tax on. This is the method that keeps your tax bill lined up with the cash you are really holding.
• Accrual method. You count income when you bill it and expenses when you owe them, regardless of when cash moves. More accurate on paper for a big operation, but it can leave you owing tax on invoices you have not collected, which is brutal for cash flow.

You are allowed to use the cash method as long as your average annual gross receipts are under roughly $30 million (the 2025 threshold, indexed each year), which is a ceiling no one reading this is anywhere near. So the choice is effectively made for you: use cash. Confirm the current threshold at irs.gov.

The one wrinkle for contractors is long jobs that straddle year-end. If you have big partially finished contracts on December 31, the tax rules can require you to handle those long-term contracts separately (often on the completed-contract method) even while you run everything else on cash. Most small outfits with jobs that wrap inside a year never hit this. If you routinely run multi-month contracts across the new year, that is exactly the point to have a CPA set up the right hybrid (see When to hire a bookkeeper or CPA).

Job costing: the part that is specific to the trades

Plain bookkeeping tells you whether the whole business made money this year. Job costing tells you whether each job made money, which is the number that actually lets you bid better next time. It means tagging every cost to the specific job it belongs to instead of dumping it into one big pile.

The cost buckets on any job are:

• Labor, meaning wages plus the real cost of employing someone. Wages alone understate it, because on top of the hourly rate you carry payroll taxes, unemployment tax, and workers' comp. That loaded cost, called payroll burden, typically adds 25 to 40 percent on top of the base wage. If you cost a job at bare wages you will think it made money when it did not.
• Materials, including what you have committed on purchase orders but not yet been billed for.
• Subcontractors, at the amount you agreed to pay them.
• Equipment, whether rented at the invoice cost or owned at a fair hourly rate for running it.
• A slice of overhead, your fixed company costs spread across the work (how you build overhead into your price is covered in How to price your work).

Worked example. You bill a bathroom remodel at $18,000. Materials ran $6,500, you paid a tiling sub $2,800, and you and a helper put in 120 hours. At a $30 wage the labor looks like $3,600, but with 35 percent burden the real labor cost is $4,860. So true direct cost is $6,500 + $2,800 + $4,860 = $14,160, leaving $3,840 before any overhead. If a fair share of overhead for a job that size is $2,600, your actual profit is about $1,240, not the $3,840 the bare-wage math suggested. Do this on ten jobs and you learn exactly which kinds of work pay and which you should stop bidding.

The monthly rhythm that keeps it from piling up

Bookkeeping goes wrong when it becomes a once-a-year archaeology dig. Keep it to a short, regular habit instead:

• Weekly: photograph and file every receipt, and log business mileage. Two minutes at the end of the day beats a lost month later.
• Monthly: reconcile, which just means matching your books against the bank and card statement so every transaction is accounted for and categorized. Chase down anything that does not match while you still remember what it was.
• Quarterly: look at the numbers before your estimated-tax payment is due, so you set aside the right amount (see How much to set aside for taxes) and you are not guessing.
• Yearly: hand a clean, reconciled set of books to whoever does your return. Clean books are the difference between a cheap tax prep bill and an expensive one.

Whether you do this in a free app, in paid software, or hand it to a bookkeeper is a separate decision covered in Accounting software for contractors and When to hire a bookkeeper or CPA. The habit matters more than the tool.

Common questions

Do I need to keep paper receipts, or are photos and bank statements enough?

A clear digital image of the itemized receipt is fine, and it beats paper because thermal receipts fade to blank within a year. The IRS accepts digital records as long as they are legible and complete. A bank or card statement alone is weaker, because it shows the amount and vendor but not what you bought, so it does not prove the purchase was a business expense. Photograph receipts the day you get them and file them by month. Keep them at least three years, since that is the general federal audit window; confirm current rules at irs.gov.

Should a small contractor use cash or accrual accounting?

Cash accounting, in almost every case. Under the cash method you record income when you actually get paid and expenses when you actually pay them, so your tax bill tracks the money you really have, and you are not taxed on invoices customers have not paid yet. Any contractor under roughly $30 million in average annual gross receipts (the 2025 threshold, indexed) can use it, which covers essentially every small trade business. The one exception is large multi-month contracts straddling year-end, which can need separate treatment. Verify the current threshold at irs.gov.

How long do I have to keep my business records?

Keep most records at least three years, the general window the IRS has to audit a return, and longer in specific cases. Hold employment tax records at least four years, and keep anything tied to an asset like your truck or equipment for as long as you own it plus three years after you dispose of it, because it affects your gain or loss. If income was seriously underreported or a return was never filed, those windows extend. These are current federal windows for 2026; confirm at irs.gov.

Can I just use a spreadsheet instead of accounting software?

Yes, when you are solo and doing straightforward work, a well-kept spreadsheet plus a separate business account is genuinely enough. The legal and tax requirement is accurate, complete records, not any particular program. A spreadsheet breaks down once you are running payroll, tracking many jobs at once, or need real job costing, because the manual entry gets slow and error-prone. At that point purpose-built software earns its keep. Accounting software for contractors covers when to make the jump.

Do I need separate bookkeeping if I am just a sole proprietor?

Yes. Being a sole proprietor changes your legal structure, not your need for clean records. You still file a Schedule C, still deduct expenses you have to prove, and still get audited on the same rules as anyone else. A dedicated business account and a simple monthly bookkeeping habit are exactly as important for a sole proprietor as for an LLC. The only thing you skip is the LLC-specific worry about piercing the corporate veil; the tax and record-keeping discipline is identical.

The honest bit

• The cash-method gross-receipts threshold, the record-retention windows, and what counts as deductible are federal rules current for 2026, and figures like the cash-method ceiling are indexed and move. Confirm the current numbers at irs.gov before you rely on them.
• Nothing here varies by state, but how much sales or use tax you owe on materials does, and that is covered separately in Sales tax on construction and Working in Your State.
• This is general guidance, not tax advice. Once you are running payroll, carrying long contracts across year-end, or the books are eating your evenings, that is the signal to bring in a bookkeeper or CPA, not to muddle through.

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