# Policy levers

Explainer · Updated 2026-09-07 · Fourth in the reading path  
Canonical: https://deaddreams.org/articles/policy-levers/

Housing policy is a stack of tools, not a single bill. Some tools try to add units. Some change who can borrow, and on what terms. Some move after-tax cost. Some pay part of the rent. This page names the levers. It does not score a Congress or a city council, and it does not invent a program’s dollar size.

**CBO scores exist for specific bills.** When a fiscal claim must be load-bearing, cite the Congressional Budget Office estimate for that bill. This desk will not invent a score.

## Supply and land use

Zoning, lot-size rules, parking minimums, environmental review, and permitting timelines decide what can be built on a parcel. Infrastructure — water, sewer, roads, schools — decides whether an entitled project can actually be occupied. Census New Residential Construction records the flow of permits, starts, and completions. It does not, by itself, say why a metro is slow.

## Housing finance

A large share of U.S. purchase mortgages still runs through Fannie Mae and Freddie Mac under FHFA conservatorship, or through FHA, VA, and USDA programs. Those are different credit boxes. Ability-to-repay and QM rules sit on top. Rate levels are market tape — see [usmarketupdates.com](https://usmarketupdates.com) — not a policy lever this page will quote as a made-up average.

## Tax treatment

Mortgage-interest and property-tax deductions, capital-gains exclusion on a primary residence, and depreciation rules for rental property change after-tax cost. They are not the same instrument as a voucher. Opportunity-zone and LIHTC design lives in Treasury and IRS guidance; this desk will not invent credit volumes.

## Rental tools

Housing Choice Vouchers, public housing, project-based rental assistance, and the Low-Income Housing Tax Credit are the usual federal rental stack. HUD publishes program rules and Fair Market Rents. State housing finance agencies add their own layers. Initiative-level write-ups belong on [affordablehousinginitiative.org](https://affordablehousinginitiative.org).

## How this desk uses the map

If the problem is cash to close or credit, look at finance and tax. If the problem is a missing unit, look at land use and infrastructure. If the problem is rent relative to income, look at the rental stack *and* the income series named on the [affordability page](https://deaddreams.org/articles/housing-affordability/). Mixing those diagnoses is how a policy conversation talks past itself.

Related: [ownership barriers](https://deaddreams.org/articles/ownership-barriers/) · [about](https://deaddreams.org/about/).