7 Money Tasks Every Solopreneur Should Do Before December 31

7 Money Tasks Every Solopreneur Should Do Before December 31

Solopreneurs have a specific December problem. There is no finance team, no HR reminder, and a handful of tax moves that only work if you make them before the calendar flips. Miss the window and you are stuck paying more in April with no way to fix it. These are the year-end money tasks worth doing before December 31, while you still can.

The short version: clean up what happened this year, and lock in the moves that have a hard deadline. Here is the list.

1. Reconcile and Catch Up Your Books

You cannot plan around numbers you do not have. Before anything else, get your books current: match every bank and card transaction, categorize income and expenses, and reconcile through the most recent month. A solopreneur who waits until spring is planning blind during the one window when planning still helps.

The risk of skipping this is not just stress. Without clean books you will miss deductions you earned, misjudge your income, and make the rest of this list guesswork. Current books are the foundation for every task below.

2. Check Your Estimated Taxes and the Q4 Payment

Solopreneurs pay taxes as they go through quarterly estimates, and the fourth-quarter payment is due in mid-January. If you have underpaid all year, this is your last real chance to close the gap and reduce an underpayment penalty.

The safe-harbor rules generally protect you if you have paid in either 90 percent of this year's tax or 100 percent of last year's, with a higher threshold for higher earners. Run a rough projection now so the January payment is a decision, not a surprise. Confirm the current thresholds, since they can change year to year.

3. Fund a Retirement Account While the Window Is Open

Retirement contributions are one of the few deductions that also build your own wealth. A SEP-IRA or a Solo 401k lets a self-employed person shelter a meaningful share of net earnings, and the amounts are far higher than a standard IRA.

Timing matters and the two accounts differ. A Solo 401k generally must be established by December 31 to make employee contributions for the year, even if funding can follow later, while a SEP can often be set up and funded up to the filing deadline. If you want the 401k option for this year, do not wait until January to open it.

4. Organize Receipts and Separate the Real Deductions

Deductions you cannot document are deductions you cannot safely take. Pull together receipts, mileage logs, home office details, and any large purchases, and separate genuine business expenses from personal ones you ran through the business by accident.

The habit that saves solopreneurs here is doing this before year-end rather than reconstructing it under audit pressure later. A shoebox of mixed receipts in April is how legitimate deductions get dropped, because it is easier to skip them than to defend them.

5. Handle 1099s, Both Directions

Two 1099 tasks hit solopreneurs. First, gather the income forms you will receive from clients so your reported revenue matches what the IRS already sees. Second, if you paid any contractor 600 dollars or more during the year, collect their W-9 now so you can issue the required 1099 in January.

Waiting until the deadline is how the scramble starts. Chasing a contractor for a tax ID in late January, after they have moved on, is a predictable and avoidable headache, and late filings carry penalties.

6. Consider Whether an S-Corp Election Fits Next Year

If your net profit has grown into the low six figures, an S-corp election can reduce self-employment tax by splitting your income into a reasonable salary and distributions. It is not free, though. It adds payroll, a separate return, and administrative cost, so it only pays above a certain profit level.

Year-end is the right time to have this conversation because the election has timing rules for when it takes effect. The caution is real: an S-corp with an unreasonably low salary is an audit target, so this is a move to make with a professional, not a DIY shortcut.

7. Time Your Income and Expenses on Purpose

As a cash-basis solopreneur, you have some control over which year income and expenses land in. If this year was unusually high, you might defer late invoices to January or prepay some deductible expenses in December. If next year looks bigger, you might do the opposite.

This is a nudge, not a loophole, and it should serve your cash flow, not distort it. Do not buy things you do not need just for a deduction, since spending a dollar to save a fraction of it is a bad trade.

Where a Bookkeeper Fits

Most of this list is easier when your books are already clean, which is exactly the problem a good bookkeeper solves before December even arrives.

Solopreneur Tax is a Sam's List firm that works with solopreneurs, small business owners, and digital nomads, the exact audience juggling all of this alone. Solopreneur Tax has 10 verified client reviews on Sam's List as of 2026-06-26. Reviews reflect the experiences of individual clients, do not represent an endorsement by Sam's List, and are not indicative of future results.

If year-end always feels like a scramble, getting help before the deadline beats fixing it after. Compare options in the Sam's List bookkeeper directory, and confirm fit before you engage.

Frequently Asked Questions

What is the most important year-end task for a solopreneur? Getting your books current. Every other year-end move, estimated taxes, retirement contributions, deduction planning, depends on knowing your real income and expenses. Reconcile and catch up first, then make decisions from accurate numbers rather than guesses.

When do I need to open a Solo 401k to count for this year? Generally by December 31. A Solo 401k usually must be established before year-end to make employee contributions for that tax year, even though funding can sometimes follow. A SEP-IRA is more flexible and can often be opened up to the filing deadline. Confirm current rules with a professional.

Do I have to issue 1099s as a solopreneur? If you paid a contractor 600 dollars or more during the year for business services, you generally must issue a 1099. Collect their W-9 before year-end so you have the tax ID ready, because chasing it in January risks a late, penalized filing.

Is an S-corp election worth it for a solopreneur? It can be once net profit reaches the low six figures, because splitting income into salary and distributions can lower self-employment tax. It also adds payroll and a separate return, so it only pays above a certain level. The salary must be reasonable, so decide with a professional.

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About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.