December moves that make tax season painless

Tax season feels brutal not because of the tax itself but because of the cleanup it triggers. In March, you are reconstructing a year you barely remember, chasing documents from vendors who have moved on, and answering your accountant's questions about transactions you cannot place. None of that work is hard. It is just badly timed.

December is when you can defuse all of it. The books are nearly complete, the year is fresh, and the people you need documents from are still reachable. A few focused hours now removes most of the friction later.

This is general guidance, not tax advice. Your specific tax situation depends on your structure, location, and circumstances, so use this to get organized and let your tax advisor handle the decisions. Here is what to work through before the year closes.

Clean and reconcile the books

Start by making sure the books actually reflect reality. Reconcile every bank and credit card account through the most recent statement, so your records match what truly happened. Reconciliation is simply confirming your books agree with the bank, and it is the foundation everything else rests on.

Then look for the loose ends that quietly distort the year: transactions sitting in an uncategorized or suspense account, duplicate entries, personal expenses that slipped into the business account, and any negative balances that should not exist. Clearing these now means your accountant starts from clean numbers instead of billing you to untangle them in March.

Chase missing documents while people still answer

The documents that cause March panic are the ones you needed from other people. The big one is contractor paperwork. For every contractor you paid during the year, you need a W-9 on file, the form that captures their tax details, so you can issue a 1099 at year end reporting what you paid them.

Chasing W-9s in late January, when a contractor has stopped working with you, is miserable. Chasing them in December, while the relationship is warm, is easy. Send the requests now and you will have what you need when filing opens.

• Confirm a W-9 on file for every contractor paid above the reporting threshold
• Flag which vendors will need a 1099 and gather their details
• Collect any outstanding receipts for larger or unusual expenses
• Gather year-end statements for loans, lines of credit, and investment accounts
• Make sure owner contributions and distributions are documented

Review categorizations and the big-ticket items

Spend an hour scanning how transactions were categorized across the year. Categorization is how each expense is sorted in your books, and miscoded items can change your taxable picture or trigger questions. Look especially at large or one-off charges and anything in vague catch-all categories, and recode what is wrong while you remember the context.

Then confirm two areas that auditors and accountants always probe. First, fixed assets: large purchases like equipment or computers that are spread across several years rather than expensed at once. Make sure significant purchases are recorded correctly. Second, accruals: expenses you have incurred but not yet paid, and income earned but not yet received. Recording these in the right period is what makes the year's profit honest. For example, a $9,000 consulting bill for December work that arrives in January still belongs to December.

Talk to your advisor before the rush

The most valuable December move is a short conversation with your tax advisor while they still have time to think. Once January hits, they are buried, and any planning move that needed to happen before year end is no longer available. A 30-minute call in December can surface decisions that are simply gone by February.

Bring them clean books and a clear picture of the year, and ask what they need from you. You are not asking them to do your filing yet; you are making sure nothing time-sensitive slips and that the handoff in the new year is smooth. Do the cleanup, chase the documents, fix the categorizations, confirm assets and accruals, and make the call. That is the whole difference between a calm filing and a frantic one.