Tools and guides to maximize your finances
No sign-up. Clear assumptions on every result.
Calculators
View allA number for the decision in front of you — tax, a house payment, or what hits the bank.
- Federal taxYou want a federal refund / owed estimate before you file.
- Loan paymentYou have amount, APR, and term for an auto or personal loan.
- IRA & 401(k) contributionYou are setting deferrals and need this year’s limit and match.
Playbooks
View allOrdered steps for a life event. Each step opens a calculator or a compare.
- TaxTax seasonEstimate federal tax, decide whether to itemize, then set withholding and retirement deferrals before year-end.
- HomeBuying a houseCap the price from income, then see the monthly payment, then check whether a refinance later would recoup costs.
This year (2026)
View allIRS and SSA figures stamped on the calculators. Confirm against the notice if you are filing.
Guides
View allShort explainers that end in a calculator — how the number is built, not advice.
- 2027 HSA Contribution Limits — $4,500 / $9,000Rev. Proc. 2026-24 sets 2027 HSA limits at $4,500 self-only and $9,000 family (+$100 / +$250 vs 2026). HDHP floors, OOP caps, catch-up, and open-enrollment notes for fall 2026 plan elections.
- 2026 IRS Mileage Rates — Mid-Year Split 72.5¢ Then 76¢Announcement 2026-11 raised the business mileage rate to 76 cents from July 1, 2026. Use 72.5¢ for H1 miles and 76¢ for H2. Medical/moving 20.5¢ then 23.5¢. Charity stays 14¢.
- 2026-2027 Special Per Diem Rates — High-Low $329 / $230IRS Notice 2026-60 rates effective Oct 1, 2026. Transportation M&IE $80/$86, high-low $329/$230, incidental $5, transition rules for late 2026, and locality list changes.