---
title: How to save for a house down payment | Allocate AI
description: Six steps from a target price to a dated goal: the real cash you need (not just the down payment), where to hold it, what funds it, and when you're ready.
canonical: https://allocateai.io/guides/how-to-save-for-a-house-down-payment
site: Allocate AI — https://allocateai.io
---

# How to save for a house down payment

Six steps from a target price to a dated goal: the real cash you need (not just the down payment), where to hold it, what funds it, and when you're ready.

A down payment is the largest goal most people ever save for, and the one where the target is most often wrong — not because people can't do arithmetic, but because "20% of the price" leaves out closing costs, moving, the first repairs, and the reserve a lender wants to see. This guide sizes the real number, then plans it like any other dated goal.

## Size the real cash number, not the down payment

For a $450,000 home:

| Item | Rule of thumb | Amount |
| --- | --- | --- |
| Down payment | 10–20% of price | $45,000–$90,000 |
| Closing costs | 2–5% of price | $9,000–$22,500 |
| Moving, first repairs, furniture | 1–2% | $4,500–$9,000 |
| Reserve after closing | 3 months of the new payment | $9,000 |

At 10% down the real number is about $70,000, not $45,000. At 20% it's about $115,000. Under 20% you'll pay [PMI](https://allocateai.io/glossary/pmi) — often worth it to buy years earlier; the [rent vs. buy calculator](https://allocateai.io/calculators/rent-vs-buy) shows the break-even for your numbers.

## Pick the date from the monthly amount you can actually keep

Take the real number, subtract what's saved, and divide by what you can put in every month without touching the emergency fund or dropping below the 401(k) match. $70,000 − $18,000 = $52,000; at $1,600 a month that's 33 months. If 33 months is too long, the levers are the number (a smaller place, a lower down payment) or the income (a bonus, a vest) — not the emergency fund.

## Hold it somewhere boring

Money you need in under five years doesn't belong in stocks. A 25% market drop the year you planned to buy is a two-year delay. High-yield savings, a money-market fund, or Treasury bills matched to the date. At 4%, $52,000 saved over 33 months earns about $2,600 — small, safe, and yours on the day.

The [compound interest calculator](https://allocateai.io/calculators/compound-interest) at 4% with your monthly amount gives the exact date.

## Point the lumps at it

A bonus, a [vest](https://allocateai.io/glossary/rsu), a tax refund, a gift. Each one is a [lump sum matched to the goal](https://allocateai.io/glossary/lump-sum-matched-to-goal) on its date, and each one pulls the date in. Two $8,000 vests move the 33-month plan to about 23 months. This is the single biggest accelerator most people leave unused.

## Keep the credit side clean while you save

The lender looks at more than the cash. Keep [credit utilization](https://allocateai.io/glossary/credit-utilization) under 30% (under 10% in the last six months), don't open new cards or financing, and keep [debt-to-income](https://allocateai.io/glossary/dti) under 36% including the new payment. Paying down a car loan in the final year can do more for your approval than an extra $5,000 of down payment.

## Know what "ready" means, in numbers

You're ready when: the real cash number is in the account, the emergency fund is still intact at three to six months of the new (higher) essentials, and the new payment — mortgage, tax, insurance, PMI, HOA — fits inside your plan with the same margin rent did. If the payment only works with the raise you're expecting, you're not ready; you're a year out.

## The plan, in Allocate

You'd say: "We want a $450k house in about three years, 10% down. We have $18k. I get $8k RSU vests in June and December." Allo-Bot proposes:

- Goal: house cash, $70,000 (down payment $45,000, closing $13,500, moving $4,500, reserve $7,000). $18,000 in hand.
- Monthly: $1,600 from take-home into high-yield savings at 4%.
- Expected income: RSU vests, June and December, ~$8,000 after tax each → house cash.
- Date: on track in 23 months, ten months sooner than on monthly alone.
- Emergency fund stays at $16,000, untouched. Card balances kept under 10% of limits from month 17.

If the target price changes — "make it $500k" — the plan re-sizes the cash number and the date and stages the change for your approval.

## Frequently asked questions

### Should I put 20% down to avoid PMI?

Not necessarily. PMI on a 10% down loan often runs 0.5–1% of the loan a year and drops off once you reach 20% equity; waiting years to save the other 10% can cost more in rent and price growth than the PMI does. Run your own numbers in the rent vs. buy calculator.

### Where should I keep a down payment while saving?

Somewhere with no chance of loss on your date: high-yield savings, a money-market fund, or Treasury bills. Anything you'd need within five years shouldn't be in stocks.

### Can I use my 401(k) for a down payment?

You can borrow from some 401(k) plans or take a hardship withdrawal, but a withdrawal is taxed and, under 59½, penalized, and a loan comes due in full if you leave the job. Both are last resorts; a longer timeline is almost always cheaper.

> This guide is educational and uses invented numbers — not investment, tax or legal advice. Your income, taxes and goals are your own; talk to a qualified professional about your situation.

## Tools this guide uses

- [Rent vs. Buy Calculator](https://allocateai.io/calculators/rent-vs-buy) — The true cost of buying a home vs. renting and investing the difference.
- [Compound Interest Calculator](https://allocateai.io/calculators/compound-interest) — Project investment growth with multi-scenario modeling, contribution changes, and lump-sum additions.
- [Closing costs](https://allocateai.io/glossary/closing-costs) — The fees paid to finish a home purchase or refinance, typically 2% to 5% of the loan amount, covering the lender, title, appraisal, and prepaid items.
- [PMI (private mortgage insurance)](https://allocateai.io/glossary/pmi) — A monthly fee added to a mortgage when your down payment is under 20%, protecting the lender if you default; it can be removed once you reach 20% equity.
- [DTI (debt-to-income ratio)](https://allocateai.io/glossary/dti) — Your total monthly debt payments divided by your gross monthly income; lenders use it to decide how much mortgage or loan you can carry.
- [Credit utilization](https://allocateai.io/glossary/credit-utilization) — The share of your available credit you are using, measured on your statement date; keeping it under 30% and ideally under 10% helps your credit score.
- [Lump sum matched to a goal](https://allocateai.io/glossary/lump-sum-matched-to-goal) — In Allocate, an expected one-off payment, like a bonus or vest, assigned to fund a specific goal, so the goal counts it and stops warning.

## More guides

- [How to plan around RSU vests](https://allocateai.io/guides/how-to-plan-around-rsu-vests) — Turn a vesting schedule into income you can plan with
- [How to save for a wedding without wrecking the rest of the plan](https://allocateai.io/guides/how-to-save-for-a-wedding) — A dated goal, funded from the right money, without stalling everything else
- [How to budget for a move or a rent increase](https://allocateai.io/guides/how-to-budget-for-a-move) — Absorb a permanent change in the biggest fixed cost, and re-date the goals around it

**Say it. Allocate writes the plan.**

Tell Allocate what changed in plain words. Allo-Bot proposes the plan from your own numbers and stages every change for your yes — nothing moves until you approve it.

[Get started](https://app.allocateai.io/signup)

---

Allocate AI is a budgeting and financial-planning app: link your accounts, say what you want in plain words, and it writes the plan and stages every change for your approval. Read more at https://allocateai.io or see all pages in https://allocateai.io/llms.txt.