- Fares are from mbta.com, checked 2026-08-19, and change over time. Treat this as a helpful estimate, not a guarantee.
- One-way trips per week can model any pattern (weekend-only, midday-only, more than 5 days, multiple trips a day), not just a standard weekday round trip.
- Monthly totals convert a weekly number using 4.345 weeks per month (365.25 days a year ÷ 7 ÷ 12). Pay-Per-Ride's total monthly cost is your one-way fare × trips per week × 4.345. LinkPass is $2.40 a ride; Commuter Rail ranges from $2.40 to $13.25 depending on your zone.
- Monthly Pass's total monthly cost (Full monthly cost on the employer side) is simply the current MBTA sticker price for that pass, before Reduced Fare, any promo, or your contribution.
- Reduced Fare uses MBTA's own Reduced Fare price schedule, not a 50%-off calculation; it's a separate, lower set of MBTA prices, broken out as its own discount line. Confirmed for Zone 1A and Zones 1-10; MBTA doesn't publish a Reduced Fare breakdown by Interzone at all, so those figures are estimated (see the tool's source code for the exact method), worth confirming directly with MBTA before relying on them.
- Employer subsidy and pre-tax savings are applied the same way to both options, after any promo or Reduced Fare discount.
- "Will you drive and park at this station?" uses that station's MBTA weekday parking rate (the largest lot when there's more than one) × the number of days a week you enter. Only stations with MBTA parking show this option, and it isn't available for Interzone routes (selected only through the employer zone dropdown).
- If you're subsidizing more than one Commuter Rail zone, each row above lists that zone's full sticker price times headcount, and those subtotals add up to Full monthly cost right below them. The promo and your contribution are applied once, after that, to reach Your estimated monthly cost.
- The 30% pre-tax savings default is MBTA's own Perq page figure, not an exact number. Adjust it if you know your own tax rate.
- Every dollar amount on this page is rounded to the nearest whole dollar for readability. The math underneath is exact; rounding only changes what's displayed, not what's calculated.
Built by A Better City | July 2026