Free Tools · No Signup · Browser-Only

Three free tax-aware calculators.

Built for solo HNW operators who want to run the same scans HELM runs on every login — without committing to a subscription. All math runs client-side in your browser. Nothing is sent to a server. Use them, share them, bookmark them.

All calculations local · zero data exposure · educational only
∑
Tax · IRC §55-§59
AMT Calculator for ISO Exercise
Inputs your W-2 income + ISO grant + strike price + FMV at exercise. Outputs estimated AMT bite (vs your regular tax), the AMT exemption phaseout, the tentative minimum tax, and the recoverable Minimum Tax Credit you can use against future regular tax.
Best for: tech employees exercising ISOs · pre-IPO equity holders · anyone modeling whether to exercise this year vs next
Open AMT calculator →
§
Tax · IRC §1202
QSBS §1202 Calculator
Up to $10M (or 10× your basis, whichever is greater) of capital gains can be excluded from federal tax on qualified small business stock held 5+ years. Calculator handles the holding-period check, the $10M-or-10× greater-of cap, and state-level addbacks (CA does NOT conform).
Best for: founders · early employees with options · angel investors · anyone holding stock from a C-corp <$50M when issued
Open QSBS calculator →
⚠
Tax · IRC §1091
Wash Sale Detector
IRC §1091 disallows a capital loss if you buy substantially identical replacement securities within 30 days before or after the loss sale. Detector handles cross-brokerage scenarios (Schwab loss → Fidelity buyback), spousal accounts, and the worst-case Rev. Rul. 2008-5 spousal-IRA permanent-loss trap.
Best for: tax-loss harvesters · operators with multiple brokerages · anyone unsure if a recent rebalance triggered §1091
Open wash sale detector →
Privacy by architecture

Your inputs never leave your browser.

Every calculator on this page runs entirely client-side. The math happens in your browser's JavaScript runtime; nothing is transmitted to HELM, Vantage Digital, or any third party. You can verify this in DevTools → Network tab while you use the calculators — you will see zero requests carrying your inputs. This matches HELM's overall architectural commitment: your financial data is yours, full stop.

Want these scans running automatically?

HELM's Tax Brain runs nine tax-aware scans across your entire portfolio every time you log in — wash sales, QSBS clocks, AMT exposure, RMD timing, IRA contribution room, §1031 exchange windows, charitable contribution timing, Roth conversion ladder optimization, and tax-loss harvest opportunities. Founding 25 lock $79/mo for the lifetime of the subscription.

See HELM founding tier →