Before preparing a self-employed tax estimate, gather your business income, expenses, expected year-end profit, other income, deductions, credits, withholding, and tax payments already made.
Your latest tax return also helps provide a starting point. However, the estimate needs to reflect what is happening this year.
For many owners, the difficult part is knowing which numbers to bring. A full bank account does not show the whole tax picture. Neither does a list of client payments.
This guide turns the preparation into a simple checklist. It also shows what to review in November and December before the year ends.
Table of Contents
What Does a Self-Employed Tax Estimate Include?
A useful estimate looks at expected taxes and amounts already paid. It helps you review whether more payments may be needed during the year.
Self-employment tax and income tax are different. Self-employment tax generally covers Social Security and Medicare. Federal income tax is a separate part of the calculation.
The IRS Self-Employed Individuals Tax Center explains this distinction and why business profit matters.
Your business structure matters too. A sole proprietor’s calculation can differ from an S corporation owner’s review. Tell your preparer how the business is taxed, rather than relying only on the letters “LLC” in its name.
An estimate is a planning tool. It does not replace the final return or guarantee a refund.
1. Start With Business Income for the Year So Far
Gather the income recorded from January through your latest completed month. Use the same period for your expense records.
Helpful records include:
- A current profit and loss report.
- Sales records and customer payment details.
- Payment processor reports, if applicable.
- Bank statements and completed reconciliations.
- Details of refunds and corrections.
Do not assume that every bank deposit is revenue. Transfers between business accounts and loan proceeds need the correct treatment. Also, check whether a payment has been counted twice.
Use the accounting method that applies to your business. Unpaid invoices can affect a cash-basis report differently from an accrual-basis report.
If the reports are confusing, start with one question: “What period do these numbers cover, and are they complete?” A clear answer is more useful than an impressive-looking total.
2. Gather Business Expenses and Supporting Records
Next, collect the expenses recorded for that same period. Group them into clear categories so your preparer can review them.
Examples to gather include contractor bills, software costs, insurance, advertising, office expenses, and business travel records where relevant.
These are records to review, not a promise that every amount is fully deductible. Personal use, documentation, limits, and timing can change the tax treatment.
Flag large equipment purchases and mixed personal-business costs. Do not assume the full cash payment automatically becomes a current-year deduction.
The IRS recordkeeping guidance explains why records should support income and deductible expenses.
NumberSquad’s tax-ready financial reporting guide can help you organize the reports before the review.
3. Project Profit Through December
An incomplete year’s results are only a starting point. Add a reasonable forecast for the remaining months.
For example, a contractor with ten completed months should consider the expected November and December work. Include the costs needed to deliver it, not just the planned sales.
Keep the forecast separate from actual results. Clearly label assumptions such as a project completion date or an expected expense.
A basic planning formula is:
Expected full-year business income − Expected full-year business expenses = Projected business profit
Book profit may need tax adjustments. Treat the result as an input for your preparer, not your final taxable income.
If you need help understanding the profit figures, read NumberSquad’s gross profit vs. net profit guide.
A Simple Example: From Sales to Projected Profit
Assume a consultant has the following results through October. All amounts are hypothetical:
- Recorded business income: $100,000.
- Recorded business expenses: $40,000.
- Business profit so far: $60,000.
The consultant expects another $20,000 of income and $8,000 of expenses in November and December.
That adds $12,000 of expected profit. The projected full-year result becomes $72,000 before any needed tax adjustments.
The consultant should bring both the $60,000 actual result and the $12,000 forecast to the review. That makes the assumptions visible.
However, $72,000 does not tell us the final tax bill. We still need the rest of the taxpayer’s information.
4. Add Other Income and Filing Details
Your business may be only one source of income on your individual return.
Gather information about wages, investment income, rental activity, retirement income, or other sources that apply. If you expect to file jointly, include your spouse’s relevant income and withholding.
Also, note your expected filing status and changes in dependents. A marriage, separation, or change in family circumstances may affect the review.
The point is to give the preparer a complete starting picture. Two people with the same business profit can have different overall tax results.
Keep these personal records secure. Use the firm’s approved document-sharing method rather than sending sensitive information through an unfamiliar form.
5. Bring Deduction and Credit Details
Gather records for items you want your preparer to evaluate. Depending on your circumstances, these may include retirement contributions, health insurance premiums, health savings account contributions, or potential tax credits.
Include dates and amounts. Separate contributions already made from those you are considering.
A deduction generally reduces income used to calculate tax. A credit generally reduces tax itself. Eligibility and limits vary, so do not subtract the same amount twice or assume a benefit applies.
For a self-employed tax estimate, the IRS estimated-tax guidance calls for reviewing expected income, deductions, credits, and taxes. Bring the facts so the preparer can apply the rules.
6. List Withholding and Estimated Payments Already Made
Keep taxes already paid separate from money merely saved in a bank account.
Prepare a list showing:
- Each federal estimated payment’s date and amount.
- The tax year assigned to each payment.
- Federal withholding shown on current pay statements.
- Any prior-year overpayment applied to this year.
- State estimated payments and withholding, listed separately.
Payment confirmations help resolve questions. A transfer into your tax savings account is not an IRS payment.
Timing matters as well as totals. A larger payment late in the year does not automatically resolve an earlier underpayment.
Your preparer can compare payments with the applicable requirements. Avoid choosing the next payment from a generic percentage alone.
7. Bring Last Year’s Return and Explain What Changed
The prior return gives useful context, including income sources, prior-year tax, and items that may carry forward.
However, tell the preparer what has changed. Perhaps revenue increased, you added a job, your spouse stopped working, or the business changed its tax status.
The IRS’s Publication 505 explains how prior-year information can help with an estimate and why current changes need attention. It also addresses payment methods for income that varies during the year.
Do not assume last year’s refund means this year’s payments are sufficient. Review the numbers that produced it and whether those circumstances still apply.
What Should You Review in November and December?
Start with the latest completed month. Correct missing transactions before relying on the profit report.
Then review three groups:
Actual results: What has the business earned and spent so far?
Remaining-year forecast: What work, costs, and personal income changes are reasonably expected before year-end?
Payment records: What has already been paid or withheld, and on which dates?
Give your preparer a short list of open questions. For example: “This report excludes one contractor invoice,” or “The final project may finish in December or January.”
Clear notes make uncertainty easier to assess. Update the estimate when the facts change.
Frequently Asked Questions
Can I use revenue instead of net profit?
Revenue alone leaves out business expenses. Bring both figures and let your preparer review the tax adjustments. Your bank balance is not a substitute for either figure.
Is self-employment tax my entire tax bill?
No. It is separate from federal income tax. State and local obligations may also apply. Check which taxes a calculator or review includes before relying on the result.
What if I do not have every final tax form yet?
Use current bookkeeping reports, pay statements, and other reliable records for planning. Mark estimated figures clearly and replace them when final information becomes available.
What if my bookkeeping is behind?
Identify the missing months or transactions first. A calculation based on incomplete profit can be misleading. Ask which records need cleanup before the estimate is prepared.
Prepare Your Numbers, Then Take the Next Step
You do not need to know every tax rule before asking for help. Start with organized records, a clear forecast, and a list of payments already made.
These details give your self-employed tax estimate a stronger foundation. They also help the tax professional identify missing information and explain the next steps.
Ready to begin? Visit NumberSquad’s starting page for small business owners and self-employed professionals and answer the opening question to see whether the service is a fit.
