A Boston hotel room advertised at the 2025 market average of $301.97 does not cost $301.97. It costs $385.11 once the city's three lodging taxes and one night of downtown parking are on the bill — 27.5% more than the number that persuaded you to click. This is the first reading of the Boston Night Cost Index, and that gap is what it was built to measure.
The index is a fixed basket priced the same way every month: the market average room rate, the 14.95% of statutory lodging tax that applies in the city, and one 24-hour space in a downtown garage. January 2025 is base 100, because it is the cheapest month in the series. Everything after that is measured against it.
The basket, and why it has three parts and not one
A room rate is not a price. It becomes a price when tax is applied, and when the costs a visitor cannot decline are added to it. In Boston the tax is unusually legible: 5.7% to the state, 6.5% to the city — a ceiling written into statute for Boston alone — and 2.75% to the convention centre financing fund. Together, 14.95% on every room night sold in the city.
Parking is the third component, and the one that changes the shape of the curve. It is a flat amount, so it weighs heavily in a cheap month and barely registers in an expensive one. Holding it constant is a documented choice rather than a measurement: no dated monthly history of garage rates is published, so the index carries the published rate unchanged and labels it as a constant. That is the single assumption in the whole basket, and it is the reason we publish the room-only series alongside the total.
What the first year shows
| Month | Room rate | Tax | Total night cost | Index |
|---|---|---|---|---|
| January | $194.66 | $29.10 | $261.76 | 100.0 |
| February | $210.46 | $31.46 | $279.92 | 106.9 |
| March | $262.19 | $39.20 | $339.39 | 129.7 |
| April | $323.71 | $48.39 | $410.10 | 156.7 |
| May | $357.70 | $53.48 | $449.18 | 171.6 |
| June | $347.46 | $51.95 | $437.41 | 167.1 |
| July | $302.57 | $45.23 | $385.80 | 147.4 |
| August | $299.70 | $44.81 | $382.51 | 146.1 |
| September | $356.08 | $53.23 | $447.31 | 170.9 |
| October | $386.46 | $57.78 | $482.24 | 184.2 |
| November | $272.81 | $40.79 | $351.60 | 134.3 |
| December | $215.29 | $32.19 | $285.48 | 109.1 |
The year runs from 100 in January to 184.2 in October and back to 109.1 by December. In dollars, the same night costs $261.76 at the bottom and $482.24 at the top — a difference of $220.48, or a second night in January for the price of the seasonal premium on one night in October.
Where the room rate and the real cost part company
Measured on the room rate alone, October stands at 198.5 against January's 100: the rate very nearly doubles. Measured on the total, October reaches only 184.2. Fourteen index points separate the two, and they are entirely the flat parking component diluting a proportional rise. It is a small illustration of a general rule: seasonal comparisons built on advertised rates overstate what the season actually costs, because part of every bill does not move with the season at all.
The tax works the other way. Because it is proportional, it magnifies: $29.10 in January, $57.78 in October. The tax bill on an October night is larger than the entire seasonal increase in many cities.
What the prices say
For anyone choosing when to come, the practical reading is that the calendar is worth more than the negotiation. Moving a two-night stay from October to January saves $440.96 on the same basket — more than most people will save by choosing a different property within the same week. Our dossier on what fills the city explains where those peaks come from, and the trip budget calculator applies the tax and parking arithmetic to your own dates.
Frequently asked
What exactly is in the basket?
Three components, fixed: the monthly market average room rate for Boston, the 14.95% statutory lodging tax, and one 24-hour downtown garage space at the published rate. Nothing else, and the composition does not change between months.
Why is January the base?
Because it is the cheapest month of the first complete year measured, which makes every later reading easy to state as a premium over the floor. The base will not move; when a new year is added it is measured against January 2025 like everything else.
How complete is the data?
The basket itself is complete: 12 months out of 12 measured. Across the full dataset, including the reference series used for validation, 59 of 72 cells are measured readings, 12 are the documented parking constant, and one is genuinely missing — October 2025 in the national reference series, unavailable because of that month's lapse in federal appropriations. We show the gap rather than fill it.
Sources
- Monthly Boston hotel performance (average daily rate and occupancy), 2025 — Pinnacle Advisory Group, published by Meet Boston
- Room occupancy excise, 5.7% — Massachusetts Department of Revenue, TIR 19-3
- Local room occupancy excise, 6.5% — MGL c. 64G § 3A; City of Boston, FY27 Revenue Estimates and Analysis, April 2026
- Convention Center Financing Fee, 2.75% — Massachusetts Department of Revenue
- Downtown 24-hour parking rate — City of Boston published garage schedule, 2026
- US lodging price series, CUUR0000SEHB02, not seasonally adjusted — US Bureau of Labor Statistics
Reuse: these figures are free to reuse, quote and chart, with a link back to this page. The detailed reference list is available on request.
💡 Working out what a trip will actually cost? The Boston trip budget calculator uses the same tax and parking arithmetic as this index.
