What’s the 20-4-10 Rule?


We’re a household of six who just lately added a furry 4 legged buddy to the combination and as such, we’ll want a much bigger automotive.

Our day by day driver is a Toyota Highlander. Earlier than getting a canine, it was beginning to get tight within the third row for our older youngsters. Should you’re driving round city, it isn’t an issue.

If you must take a highway journey of greater than 4 hours, which we do about three or 4 instances a yr, it is uncomfortable bordering on inconceivable as the children get taller.

Now that we have added a canine, the Highlander is not chopping it. It is time to for a minivan!

We have been taking a look at a Toyota Sienna and that is once I stumbled onto the the 20-4-10 rule – a helpful rule of thumb for serving to you identify how a lot automotive you’ll be able to afford.

The 20-4-10 Rule

The 20-4-10 rule is a straightforward one:

  • Put 20% down
  • Select a reimbursement interval of 4 years (or fewer)
  • Spend lower than 10% of your month-to-month pay on all transportation prices

20% down – 4 yr mortgage – 10% of take dwelling pay

This assumes you take out a mortgage to purchase the automotive. Should you will pay money, do no matter you need! This is not a rule for that.

Since this does contain a mortgage, how a lot you are in a position to afford will rely in your credit score rating. Your rating will decide your rate of interest, which impacts how a lot you’ll be able to pay.

How A lot Automobile Can I Afford?

The next desk comes from Experian and whereas it is utilizing numbers from 2023 and VantageScore (not FICO), they’re efficient sufficient for our examples under:

Credit score RatingCommon New Automobile FeeCommon Used Automobile Fee
Deep subprine (579 or under)14.08%21.32%
Subprime (580 – 619)11.53%18.55%
Nonprime (620 – 659)8.86%13.28%
Prime (660 – 719)6.40%8.75%
Tremendous prime (720 or above)5.18%6.79%
Supply: Experian; desk relies on scores calculated utilizing the VantageScore® credit score scoring mannequin, 2023

Working backwards, we will calculate how a lot automotive we will afford based mostly on the 20-4-10 rule.

Listed below are our assumptions:

  • You are taking dwelling $5,000 a month after taxes. Based mostly on the rule, you’ll be able to spend $500 a month minus your different transportation prices (insurance coverage, gasoline, and so forth.).
  • Your credit score is Nonprime. This implies on a brand new automotive, you may pay 8.86% APR on a mortgage.
  • You should utilize Calculator.internet’s Auto Mortgage Calculator to learn how a lot you’ll be able to afford.

The calculator contains title, registration, and different charges based mostly in your state (a pleasant function of the calculator) so you already know your all in price.

When utilizing the calculator, we set the down fee to $0 after which work backwards as soon as the calculator tells us how a lot automotive we will afford.

Based on Calculator.internet with a $500 a month fee (which assumes ZERO different prices, which isn’t true), you’ll be able to afford a automotive that prices about $20,000. Add within the 20% downpayment and that is, roughly, a $24,000 automotive on a month-to-month take dwelling pay of $5,000.

For tough calculations, that is adequate.

To be extra exact, if you wish to observe this rule, you may need to calculate how a lot you’re spending in gasoline, insurance coverage, and every part else to remain throughout the 10% restrict.

“However I Cannot Afford Something Good”

The rule is not meant to search out you a automotive that matches your style. Or what you want in a automotive. Or what you assume it says about you.

It’s strictly math.

Your earnings could not help the kind of automotive you need to drive however life is about tradeoffs. Sacrifice at the moment for tomorrow. Sacrifice tomorrow for at the moment. You select.

There are many used automobiles below $15,000 which are protected, dependable, however not one thing you assume is worthy of “displaying off.” However then once more, would you reasonably exhibit with a car at the moment or exhibit on a trip in retirement?

That is the the purpose of the rule.

It is to set expectations at the moment so you’ll be able to retire comfortably tomorrow.

It is Only a Rule, Not a Legislation

The reasoning behind the 20-4-10 rule is that will help you perceive how a lot automotive you’ll be able to afford comfortably. It isn’t a regulation of man or a regulation of physics, you are able to do no matter you need.

Very like the 50-30-20 funds rule, it is a guideline to assist you decide.

With the 50-30-20 funds, you are aiming to spend 50% of your take dwelling pay on wants, 30% on stuff you need however do not want, and 20% on financial savings. A automotive would probably fall into the class of wants and should you observe the rule of thumb about housing (30% or much less), you are left with simply 20% to your different wants.

Should you spend 10% on a automotive, that leaves 10% on all different wants. (otherwise you dip into 30% for needs and 20% for financial savings)

It is all about allocating scarce assets (your earnings) and these guidelines might help you navigate them however they aren’t set in stone.

However like many guidelines, you’ll be able to break it. You should buy extra automotive than what the rule suggests, you simply must stay with it!