Methodology — True Lifestyle Cost Index

True Lifestyle Cost Index — Housing + Utilities + Commute. Published by TLCengine · Krishna Malyala, broker, NMLS #1875937 · methodology version 1, June 2026 · contact: krishna@tlcengine.com

This page is the citable reference for journalists, researchers and answer engines. It states what the index measures, where every number comes from, and how we validated it. We publish the framework and sources in full; the production routing engine and calibration internals are proprietary.

---

What the index measures

The True Lifestyle Cost Index asks one question: what share of a household's income does it really take to live in a place and get to work? The familiar rule of thumb — spend no more than 30% of income on housing — counts only the rent or mortgage line. Two other bills move in with you: the utilities and the commute.

True Lifestyle Cost %  =  12 × (H + U + C)  ÷  annual income

• H — housing (shelter). The market cost of the home itself, from the latest U.S. Census American Community Survey (2020–2024 five-year estimates, tenure-weighted across renters and owners), with the utility portion that Census embeds in "gross rent" and "owner costs" stripped out so it is never counted twice.
• U — utilities, reported two ways. Utilities (energy) is home energy only — electricity, gas and other heating fuels — built from the U.S. Department of Energy's LEAD dataset at county and census-tract level, by income bracket, and trended to current prices with the U.S. Energy Information Administration's monthly state price series. Utilities (full) — the index's headline scope — adds water/sewer and cell phone service (Bureau of Labor Statistics Consumer Expenditure Survey), fixed broadband (FCC Urban Rate Survey), and trash collection where it is billed separately rather than funded through property taxes.
• C — the commute, computed, not modeled. TLCengine's routing engine prices the actual door-to-door journey — train, car, or park-and-ride — using posted prices: transit zone fares, bridge and tunnel tolls, the NYC congestion charge, station and garage parking, and current fuel prices. The index models a household, not a lone commuter: commute costs are scaled by the Census-measured number of workers per household in each county.

The income question — you choose the denominator

Affordability claims are extremely sensitive to whose "median income" they divide by. The index therefore publishes every figure on selectable income bases, and labels the basis on every number:

basis	source	what it represents
HUD Area Median Income (default)	HUD FY2026 income limits	the housing industry's "AMI" — a median family income benchmarked to a 4-person household
HUD 80% limit	HUD FY2026 published limits	HUD's "low income" threshold (capped and adjusted — in some high-cost areas it exceeds the area median itself)
Median household income	ACS 2020–2024	the area's own median household — includes single people and seniors, so it reads well below "AMI"
Your income	user-entered	your number

In the New York tri-state pilot, HUD AMI runs on average 47% above the metro median household income. The same county can clear an affordability line on one basis and miss it on another — that is a fact about the bases, and the index shows it rather than hiding it.

Affordability line and tiers

A place is TLC-affordable when the index is at or below 48% of income — the classic 30% housing envelope, plus 15% for getting to work, plus an explicit 3% utilities allowance. Alongside the line, every place carries a percentile tier within its metro (quintiles, 1 = most affordable fifth), so rankings survive any debate about the denominator.

Sources (all public, all citable)

layer	source	vintage
Housing, incomes, workers per household	U.S. Census Bureau, American Community Survey 5-year	2020–2024
Home energy	U.S. DOE, Low-Income Energy Affordability Data (LEAD)	2022, price-trended
Energy price trend	U.S. EIA residential price series (electricity, natural gas, heating oil)	monthly, current
Income limits	HUD income limits (huduser.gov)	FY2026
Broadband	FCC Urban Rate Survey, fixed broadband	2026
Water/sewer, cell phone	BLS Consumer Expenditure Survey	2024
Fares, tolls, congestion charge, parking, fuel	posted tariffs and rate schedules in TLCengine's commute-cost database	effective 2026
Trash norms	municipal budget research (NJ default: tax-funded, $0 as a separate bill; toggle for private-hauler townships)	2026

Every published page carries per-number source lines and as-of dates. Data quality is tiered honestly: federal sources at the target geography carry the highest tier; where the best free national source is coarser than we want (water rates are the canonical example — the national rate surveys are paywalled or discontinued), the index says so and anchors against posted local tariffs (e.g., NJ American Water's BPU-filed rates).

Validation

• Against the established benchmark. County results were compared with the Center for Neighborhood Technology's H+T® Index (2022), the longest-standing housing-plus-transportation measure. On the comparable construct, the correlation is r = 0.90 (rank correlation 0.87) across the pilot counties — the two indexes agree on which places are expensive. They differ exactly where they should: CNT models all household travel including car ownership; the True Lifestyle Cost Index prices the commute itself, leg by leg. (H+T® Index data © CNT, htaindex.cnt.org, used for comparison only; no affiliation.)
• Against ground truth. The routing engine's travel times are validated against published schedules and an independent OpenTripPlanner instance on real origin-destination pairs (e.g., Edison NJ → Penn Station); fares are validated against posted tariffs (NJ Transit zone fares, LIRR/Metro-North peak fares, Port Authority tolls, the $9 NYC congestion charge, posted garage rates).
• Internal consistency. Housing-plus-energy shares track the ACS-based housing share of the benchmark at r = 0.95; the commute share is lower than CNT's all-travel share everywhere, by a stable margin — that gap is the cost of car ownership and non-work travel, not noise.

What we publish — and what we don't

Published: the framework above, every source with vintage, the validation results, county tables, and the full component breakdown on every page (housing / energy / water / broadband / cell / trash / commute, each with its source). Not published: the routing engine internals and calibration parameters (the index's computed-commute layer is TLCengine's proprietary technology), and any third party's licensed data.

One paragraph for citation

The True Lifestyle Cost Index, published by TLCengine, measures the combined cost of housing, utilities and the commute as a share of income. Housing costs come from the latest U.S. Census American Community Survey; utilities from U.S. DOE, EIA, FCC and BLS data; and commute costs are computed door-to-door from posted fares, tolls, congestion charges, parking and fuel prices by TLCengine's routing engine, scaled to the household by Census workers-per-household. Results are published on selectable income bases (HUD area median income by default) and validated against the Center for Neighborhood Technology's H+T® Index at r = 0.90 on comparable measures. A place is "TLC-affordable" at or below 48% of income.

---

TLCengine and the True Lifestyle Cost Index are not affiliated with, endorsed by, or sponsored by the Center for Neighborhood Technology. H+T® is a registered trademark of CNT. The index is research and comparison material, not financial advice.