FirstSource — Tax Tools
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The FirstSource Tax Planning Calculator

The same tool our advisors run live in every planning session — federal and California, side by side, so you see the number change as we test a decision, not after.

EIC & CalEITC
LLC vs. S-Corp
W-2 vs. 1099-NEC
Withholding review
Capital gains
Same-day client summary
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Quick Tax Bracket Estimator

A rough estimate for single filers, illustrative only — not a substitute for a planning session.

$10,000$400,000
Marginal Bracket
22%

Document Checklist

  • Photo ID & Social Security cards
  • W-2s and/or 1099s
  • Mortgage & property tax statements
  • Health coverage forms (1095-A/B/C)
  • Prior-year tax return
  • Childcare & education expense records
  • 1099-NEC / 1099-K forms
  • Income & expense summary or bookkeeping export
  • Mileage & home-office records
  • Quarterly estimated payment records
  • Retirement contribution records (SEP/Solo 401k)
  • Health insurance premium records
  • Formation documents (Articles, EIN letter)
  • Profit & loss statement, balance sheet
  • Payroll & W-2/1099 filings issued
  • Sales tax filings on file
  • Prior-year business return
  • Employer health plan documents

Self-Employed Quarterly Tax Estimator

Rough self-employment tax on your net 1099 income — a starting point, not a filing figure.

$5,000$250,000
Est. Quarterly SE Tax
$2,124

W-4 Withholding Checkup

One question tells you which way to adjust.

You may be over-withholding. A big refund means the IRS held your money interest-free all year. Consider claiming an extra allowance on your W-4 to keep more in each paycheck.

You may be under-withholding. Owing at filing time (plus a possible penalty) usually means too little was withheld. We can help you re-file a W-4 with your employer.

Good sign. Your withholding is close to accurate. Still worth a recheck any time your income, filing status or number of jobs changes.

"One Big Beautiful Bill" Guide

What the 2025 federal tax law changes mean for your return this year, in plain English.

Read the guide →

ITIN & Notary Quick Reference

Who needs an ITIN, what a certified CAA does, and which documents notarize on the spot.

Read the ITIN guide →

Track Your Refund

Jump straight to the official tracker once your return is filed — federal or California state.

Federal (IRS) → California (FTB) →

Not sure where to start?

Book a free 15-minute call and we'll point you to the right service.

Book a Free Call

Common questions

按小时收费容易在无形中助长效率低下的问题。我们会依据您报税或申报案件的复杂程度,在开始前预先报出固定费用,让您清楚了解需要支付的金额 — 我们看重的是服务品质,而非耗费的时间。

Yes. Every tax engagement includes a coverage review at no extra charge. If you decide to act on a gap we find, policy placement is a separate conversation — there's never any obligation.

Yes — appointments can be held virtually or in person at our Westminster office, including evenings and weekends, whichever fits your schedule better.

Your most recent return, recent pay stubs, and a rough sense of this year's income. For individuals, also tell us what's changed at home — new dependents, marriage, a move, a new job — since that shapes the numbers as much as the income does. Anything on the horizon (a home sale, a new business, a retirement decision) is worth mentioning too. When in doubt, just bring what you have — we'll tell you if we need more.