Quarterly Tax Calculator 2026 for Self-Employed | Estimated Tax Set-Aside Spreadsheet, Freelancer IRS Due Dates & Safe Harbor Planner

Descripción del vendedor

Freelancers: stop guessing what to set aside for taxes. The Kollaz Quarterly Tax Set-Aside Calculator 2026 is an Excel spreadsheet that turns your quarterly freelance income into a clear dollar set-aside. It covers federal income tax plus 15.3% self-employment tax, from real 2026 IRS figures. It includes a safe-harbor check and every 2026 IRS due date.

This is for a self-employed US freelancer who needs to set aside the right amount for quarterly estimated taxes and avoid underpayment penalties.

Freelancers: stop guessing what to set aside for taxes.

This 2026-edition spreadsheet turns your quarterly freelance income into a clear dollar amount to set aside each quarter. It covers federal income tax plus self-employment tax, computed from the REAL 2026 IRS figures (2026 brackets and standard deduction from IRS Revenue Procedure 2025-32; 15.3% SE tax on 92.35% of net earnings). No flat-percentage guessing.

WHAT YOU GET (instant download, Excel .xlsx, no macros):
- Inputs tab: your quarterly net income, filing status (single or married filing jointly), and optional last-year tax for the safe-harbor check
- Set-Aside Dashboard: per-quarter recommended set-aside in dollars, safe-to-spend after tax, and a quarterly bar chart
- Underpayment check: the IRS safe-harbor rule explained in plain English. 100% of last year's tax (110% if AGI was over $150k) or 90% of this year's, per quarter, with a warning flag if a quarter falls short
- Due Dates tab: every 2026 IRS estimated-tax deadline with a live countdown (Apr 15, Jun 15, Sep 15 2026; Jan 15 2027; return due Apr 15 2027)

HONEST LIMITS: federal taxes only (state not included); assumes the standard deduction; annual tax is split across quarters by income share (a planning simplification). Very high earners: the Social Security wage-base cap is not modeled. This is a planning tool, not tax advice. Confirm payments with a tax professional.

READY FOR MORE? This calculator is the perfect companion to the Kollaz Self-Employed Finance Center and SE Tax Organizer. Graduate from quarterly set-asides to a full year-round tax system.

COMPATIBILITY: Excel .xlsx, no macros. Tested working in Microsoft Excel (desktop + web) and Google Sheets.

Try the live demo (view-only sample): https://docs.google.com/spreadsheets/d/11GPQhlUxnnazzCaPmDLvTM4nY8irRqiJv6skoQYIFLk/edit?usp=sharing

Created with AI assistance. From Kollaz: smart financial tools for modern money.

How much should I set aside for quarterly estimated taxes in 2026?
Enter your quarterly net income and filing status. The Set-Aside Dashboard gives you a per-quarter dollar set-aside. It covers federal income tax plus self-employment tax, computed from real 2026 IRS figures (2026 brackets and standard deduction from IRS Revenue Procedure 2025-32; 15.3% SE tax on 92.35% of net earnings). No flat-percentage guessing.

When are my 2026 estimated tax payments due?
The Due Dates tab lists every 2026 IRS estimated-tax deadline with a live countdown: Apr 15, Jun 15, Sep 15 2026; Jan 15 2027; return due Apr 15 2027.

How do I avoid underpayment penalties?
The underpayment check explains the IRS safe-harbor rule in plain English. 100% of last year's tax (110% if AGI was over $150k) or 90% of this year's, per quarter. A warning flag appears if any quarter falls short.

What are the honest limits of this calculator?
Federal taxes only (state not included); assumes the standard deduction; annual tax is split across quarters by income share. Very high earners: the Social Security wage-base cap is not modeled. A planning tool, not tax advice.

Q: Does this replace the 1099 Tax Playbook?
A: They pair. This calculator gives you the quarterly dollar number; the playbook (4582465302) teaches the whole system. That includes the five-step calculation, safe harbors, deductions, and QBI.

Q: Does it cover state taxes?
A: No — federal taxes only. Confirm payments with a tax professional.

Q: What if my income varies by quarter?
A: Enter each quarter's net income; the dashboard gives a per-quarter set-aside and the annual tax is split across quarters by income share (a stated planning simplification).

Q: Is the compatibility claim final?
A: Not yet. Google Sheets / Excel for the web testing is in progress; the listing will be updated once verified. Keep the current honest wording until then.

Format: Excel .xlsx spreadsheet (no macros)
Tabs: Inputs (quarterly net income, filing status: single or married filing jointly, optional last-year tax for safe-harbor check), Set-Aside Dashboard (per-quarter set-aside in dollars, safe-to-spend after tax, quarterly bar chart), Underpayment check, Due Dates tab
Compatibility: Excel .xlsx. Google Sheets / Excel for the web testing in progress; listing will be updated once verified
Region: US federal estimated taxes only
Maker: Kollaz: Smart financial tools for modern money
Delivery: instant digital download
Companion: the perfect entry point to the Kollaz Self-Employed Finance Center and SE Tax Organizer