How to Estimate Your Tax Payment (Without Needing a PhD in Math)
Let’s get real—figuring out how much to send in each quarter isn’t always straightforward, especially if your income fluctuates or you have multiple streams.
But paying something is always better than paying nothing. Below are five methods to estimate your tax payment, ranked from easiest to most detailed. Choose the one that fits your time, energy, and goals.
Method 1: I Didn’t Owe Last Year
If you didn’t owe anything on your prior year tax return and your income and deductions haven’t changed much, you’re probably fine skipping a payment. Check your withholdings and deposits for peace of mind.
Method 2: I Owed Last Year and Made About the Same
If you owed tax on your prior year return and made about the same this year, send in 25% of the same amount you owed when you filed your return. It won’t be perfect, but it should keep penalties away.
Method 3: The Safe Harbor Shortcut (aka 25–30% Method)
If your income is growing and you want a simple, penalty-buffered way to stay ahead:
- Estimate your quarterly profit
- Multiply by 25–30%
- Send that in
This won’t guarantee a refund, but it’ll reduce your risk of underpayment penalties.
Method 4: Use Your Tax Rate (for the math-inclined)
Want to dial it in more precisely?
- Look at your prior year tax return to find your marginal tax rate.
- Estimate how much more income you’re earning this year.
- Multiply that income by your marginal rate.
- Add that to any tax you owed last year.
- Divide by four and use that number for quarterly payments.
Example:
You earned $50K more this year and your marginal tax bracket is 24%. That’s about $12,000 more in tax. If you owed $5K last year, your total for the year might be $17K—about $4,250 per quarter.
Method 5: Do a Full Mock Return
If you want to get as accurate as possible:
- Gather current income, expenses, and deductions
- Run a full mock return using software or a spreadsheet
- Subtract withholdings
- Divide the remaining amount by four
This is the most accurate method, but also the most time-intensive. If you’re missing info, consider padding your estimate by 5–10% just to be safe.
Pro Tips:
- Mix of Income Sources? Factor in W-2 wages and withholdings.
- High AGI? If your adjusted gross income was over $150,000 on your prior return, you need to pay at least 110% of that tax to avoid penalties.
- State Taxes: Check your state’s estimated payment rules. Some require separate filings.
Final Reminder:
Filing an extension gives you more time to file—not more time to pay. Whether you’re sending in quarterly payments or making an extension deposit, the sooner you estimate, the better.
Need help running the numbers, or want expert assistance? Book a tax planning consult!
