How Much Monthly Income Do I Need to Retire?

The Short Answer

Think of your retirement as three buckets of monthly money. Bucket one is what you spend each month once you stop working. Bucket two is income that arrives no matter what: Social Security in the US, or CPP and OAS (the Canada Pension Plan and Old Age Security, Canada's public pensions) in Canada, plus any employer pension. Bucket three is the gap, the amount bucket two leaves uncovered, and that gap is what your savings have to produce every month.

That gap is almost always much smaller than your full spending. Once you see it written down, the whole question gets easier.

Why Monthly Works Better Than One Giant Number

Most articles tell you to save some enormous pile of money. But you don't spend your retirement all at once. You spend it in monthly chunks, just like you do now. If you already run a household on a monthly budget, you already have the skill this calculation needs.

Working in months also protects you from panic. A million dollars sounds impossible. Two thousand dollars a month of extra income sounds like something you might actually build. Same facts, calmer brain.

If you want the full version of this math, including lump-sum targets, our guide on how much money you need to retire walks through it step by step.

Step 1: Write Down What You Spend Each Month Now

List your real monthly expenses. Be honest and complete. Housing, food, utilities, transportation, insurance, phone, subscriptions, debt payments, fun money. Round generously rather than tightly, because surprises cost more when you no longer have a paycheck.

Some of these costs shrink or disappear in retirement:

• Commuting and parking often go away.
• Work clothes, lunches out, and dry cleaning shrink.
• Payroll deductions, like your share of retirement contributions, end.
• If you still owe a mortgage, it may be paid off during retirement. But not everyone retires mortgage-free, so only remove it if that matches your plan.

Other costs grow or appear:

• Health care. In the US, Medicare coverage generally starts at 65. If you retire earlier, you pay for coverage yourself in the meantime. You can read the details at medicare.gov.
• Time costs money. Days that were once spent at work now cost something: hobbies, trips, projects around the house.

A reasonable starting guess for many people: your retired monthly spending will land somewhere near your current spending, minus commuting and payroll deductions, plus whatever extra you plan to spend on life you actually enjoy.

Step 2: Subtract the Money Coming In Without Lifting a Finger

Now find the income you'll receive automatically:

• Social Security in the US. It can start as early as 62, and for anyone born in 1960 or later, the age for your full payment is 67. Taking it earlier shrinks the monthly check; waiting past full retirement age grows it.
• CPP in Canada. It can start as early as 60, though starting early means a smaller monthly amount. Waiting past 65 makes the monthly amount bigger.
• OAS in Canada. This one can be delayed past its standard start age of 65, all the way to 70, for a larger monthly payment.
• Any workplace pension from a current or former employer.
• Rental income, royalties, or other steady sources, if you have them.

Your best estimates come straight from the source. In the US, your statement at ssa.gov shows your projected monthly benefit. In Canada, your account at canada.ca shows projected CPP and OAS amounts.

Timing matters a lot here. If you want to understand the tradeoffs, see when to take Social Security.

Step 3: Turn the Gap Into a Number Your Savings Must Hit

Here is the core formula, in plain words:

Monthly spending minus automatic monthly income equals the monthly gap.

Your savings then have to generate that gap every month, for the rest of your life.

One popular way to size the savings is the 4% rule: in your first year of retirement, you withdraw 4% of your savings, and then bump that amount up each year for rising prices. Four percent works out to about 25 times the annual amount you need. So multiply the gap by 12 to get a yearly figure, then by 25 again.

For example, say you and your spouse expect to spend $5,000 a month in retirement:

1. Expected monthly spending: $5,000.
2. Combined Social Security and a small pension: $2,500 per month.
3. Monthly gap: $5,000 minus $2,500 = $2,500.
4. Yearly gap: $2,500 times 12 = $30,000.
5. Savings needed at the 4% rate: $30,000 times 25 = $750,000.

Not perfect math, but a solid starting estimate. Our 4% rule guide explains where it comes from and when it bends.

See the Numbers at Three Spending Levels

Same household benefits ($2,500 per month), three different spending habits. The savings column uses the 4% method:

Monthly spending	Automatic income	Monthly gap	Yearly gap	Savings needed
$4,000	$2,500	$1,500	$18,000	$450,000
$5,000	$2,500	$2,500	$30,000	$750,000
$6,000	$2,500	$3,500	$42,000	$1,050,000

Notice how much power sits in step 2. Every automatic dollar your benefits provide removes 25 potential dollars from the savings goal. Delaying Social Security, CPP or OAS, or keeping a pension intact, does more heavy lifting than most people expect.

Four Things That Bend the Monthly Number

Taxes. Some of your retirement income arrives pre-tax. Withdrawals from a traditional 401(k) or IRA (US retirement accounts funded with money that was not taxed going in) are taxed as income. RRSP withdrawals are taxed in Canada too, since an RRSP is a registered retirement account where you got the tax break when contributing. Money from a Roth account (a US account you funded with tax-already-paid money) or a TFSA (Canada's tax-free savings account) generally comes out without extra tax owed. So a $3,000 pre-tax withdrawal puts slightly less spendable cash in your pocket than $3,000 from a Roth or TFSA. The full picture lives in how taxes work in retirement.

Inflation. Prices rise over the years, so the same monthly buying power costs more later. Any decent plan raises your monthly income target over time, not just the first year.

The gap years. If you retire before benefits start, you carry the entire monthly bill alone for a while. Someone retiring at 58 who waits until 67 for full Social Security pays themselves from savings for roughly nine years. Those years need their own funding, above and beyond the lifelong gap.

Lumpy years. Travel splurges, a new roof, dental work. Most retirees swing above and below their average month. Build a little cushion into your monthly figure so an expensive year doesn't blow up the plan.

What If the Gap Looks Too Big?

Two levers move it, and neither requires heroics. You can lower the monthly spending you actually need, sometimes significantly, by trimming recurring costs or relocating to cheaper housing. Or you can widen the automatic income side, by claiming benefits later or delaying retirement itself, even a single year raises most people's checks while adding a year of savings.

And here is the kind part: finding a big gap today is not failure. It is information, found while you still have decades to respond. The When Can I Retire check takes your actual numbers, works out the age you can retire and how ready you are today, and shows every step of the math, including benefits, taxes, inflation and those tricky years before payments begin.

Run the numbers once. Sleep better tonight.