The exact list depends on your business structure and industry, but the core documents are the same for most service and trade businesses. Start gathering these well before your filing deadline so nothing gets missed.

Income records come first. You need bank statements for every business account for the full year. If you invoice customers, you need a summary of all invoices sent and payments received. For contractors and trades, this often includes progress billing records and retention amounts. If you received payments through apps like Venmo or Zelle for business work, those count too.

Expense documentation is where most business owners fall short. You need receipts or records for materials, supplies, tools, equipment purchases, insurance premiums, license and permit fees, advertising costs, office expenses, and professional services. Bank and credit card statements help fill gaps, but ideally you have the actual receipts for anything significant. For construction and field service businesses, material costs and supply runs add up fast and are easy to lose track of without a system in place.

1099 forms matter on both sides. Collect every 1099-NEC or 1099-MISC you received from customers who paid you $600 or more. Just as important, you need records of every subcontractor or independent contractor you paid $600 or more during the year because you’re responsible for issuing 1099s to them. Missing this creates problems with the IRS for both you and the people you paid.

Payroll records are required if you have employees. Year-end payroll reports, W-2s, quarterly 941 filings, state payroll tax filings, and workers’ comp documentation all need to be accounted for. Your payroll provider should generate most of these, but confirm you have everything before handing things off.

Vehicle and equipment records are big for trades and contractors. If you’re deducting vehicle expenses, you need either a mileage log or records of actual expenses like fuel, maintenance, and insurance. For equipment purchases, keep the invoices showing what you bought, when, and how much you paid. Section 179 deductions and bonus depreciation can save you a lot, but only if you have the documentation to support them.

Loan documents matter if you took on any financing during the year. Interest paid on business loans is deductible, so have your lender statements showing principal and interest breakdowns. This includes equipment financing, lines of credit, and vehicle loans used for business.

If your books are current and accurate, most of this information is already sitting in your accounting software. A clean set of books means your business tax return preparation goes faster, costs less, and results in fewer surprises. If your books are a mess or nonexistent, the document gathering process becomes the tax preparer’s way of reconstructing what happened all year, which takes longer and often means missed deductions.

The best thing you can do is keep a folder, physical or digital, where documents go throughout the year instead of scrambling in March. A Long Beach bookkeeper who understands your industry can keep everything organized month to month so tax time is just a matter of pulling reports rather than digging through shoeboxes and email threads.