Save or Invest? One Question Decides It

Over one year, stocks ended lower about one year in four. Over three years, it still happened 15 times. By ten years it had happened five times, and over every 20-year stretch since 1928, $100 ended higher. Past results don’t promise future ones, but the pattern is the reason for the rule: the shorter the wait, the more likely the money is down on the day you need it.

The worst cases in the table all come from the Great Depression years, which is a long way back. From 1957 on, the worst ten-year stretch was 1999 to 2008, when $100 ended at about $87.

Money for next year’s rent deposit, a car, a wedding or an emergency belongs somewhere it can’t fall: a high-yield savings account at an FDIC-insured bank, insured up to FDIC limits. The best paid a little over $4 a year per $100 in October 2026, roughly what prices rose over the year to September: $3.70 per $100, according to the Bureau of Labor Statistics. That’s the job: keeping the money whole and ready.

Money you won’t touch for five years or more can take a bad year, and it has more time to wait one out, though 11 of the 94 five-year stretches since 1928 still ended lower. That’s where investing earns its place. The S&P 500 has averaged about $10 a year per $100 since 1957, with dividends reinvested. That’s the reason to invest money that can wait: a chance to grow faster than prices, with the risk of losses along the way.

The condition is real, though. “Can leave it alone through a drop” means you wouldn’t need to sell if it fell by more than a third, the way it did in 2008, when $100 fell to about $63.

For a goal three to five years away, there’s no clean answer. One option is to keep part of it in savings and invest part, then move more into savings as the date gets closer.

Once you know the timeline, a second question tells you where to put your effort. Nick Maggiulli, who writes the blog Of Dollars And Data, has a simple rule for it: if you can save more in a year than your investments could earn, focus on saving.

Say you have $2,000 invested. If it grew $8 a year per $100, a year like that adds about $160. Saving $200 a month adds $2,400. Early on, the habit of saving moves the total far more than the market does. With $200,000 invested, the same kind of year could add about $16,000, and returns start to matter more than the next deposit.

Illustrative only: 8% assumed annual return, set below the S&P 500's long-run average of about 10% since 1957. Not a forecast or a guarantee. Real results will differ and you can lose money.

So if you’re starting out, don’t agonize over which fund to pick. Agonize over how much you can put in.

If you carry a credit card balance, paying it down usually comes before both. Card accounts that were charged interest paid about $22 a year per $100 in August 2026, according to the Federal Reserve. That’s about five times what the best savings accounts paid, and no investment return is guaranteed.

Coinage’s Nests are investments, so they belong with the five-years-or-more money. Coinage isn’t a bank account, so money you need sooner belongs at an insured bank.

A Nest is a portfolio you build yourself, held in the investing account you connect. You choose what it holds and the mix, and you can set a recurring buy every week, every two weeks or every month. If the money has a date on it, a Goal Nest adds a target and a date and works out what to add each week, every two weeks or each month. The free plan includes one Nest and one goal.

Ask when you’ll need it. Under three years, save. Five years or more, and you can sit through a drop, invest. In between, split it and shift toward cash as the date nears. Then ask how big your balance is, and put your effort where it moves the total most.