When it comes to saving for retirement, what difference can another 1% of your pay make?

Plenty.

Thanks to the magic of compounding, “a little bit (of extra savings) today can go a long way tomorrow” in terms of the retirement income it’ll generate, says Fidelity Investments, which crunched the numbers for a report released this week.

According to Fidelity’s calculations, a 25-year-old with a $40,000 salary must set aside an additional $33 a month to save an extra 1% annually. But that little bit of extra savings will translate into an additional $320 of monthly income (in today’s dollars) over a 25-year retirement. (This assumes our 25-year-old earns a 1.5% annual raise, net of inflation, works until he is 67, and invests his savings in assets that earn a 7% annual return.)

Of course, the benefits are less dramatic for those with shorter time horizons. But that doesn’t mean the strategy isn’t worthwhile.

According to Fidelity:

A 35-year-old with a $60,000 salary who saves an extra 1% annually must save $50 more a month now, but will receive an additional $270 of monthly retirement income in today’s dollars.

A 45-year-old with a $70,000 salary who saves an extra 1% annually must save $58 more a month now, but will receive an additional $160 of monthly retirement income in today’s dollars.

A 55-year-old with an $80,000 salary who saves an extra 1% annually must save $67 more a month now, but will receive an additional $70 of monthly retirement income in today’s dollars.

The message: Small steps can have big consequences when it comes to retirement.

“When you ask people, ‘Can you save more?’ many people think, ‘I can’t,’” says Jeanne Thompson, a vice president at Fidelity. That’s because they “assume that they have to save so much more and a little bit isn’t going to make a difference.” But the key insight, she adds, is that “little incremental differences can make a huge difference over time.”

According to Fidelity, many people underestimate the impact saving 1% more can make. When asked how much an extra $50 a month would amount to over a 25-year period, the median response was $17,000—or less than half the $44,000 value Fidelity projects.

Fidelity recommends putting away 10% to 15% of annual pretax pay for retirement, including matching contributions from an employer. “But if you don’t save this much from the get-go,” don’t despair, the company says. “Start by saving up to the company match,” says Thompson and then increase your savings rate by 1% every year until you hit the 10% to 15% target.

More potentially good news: When told the benefit of saving 1% more, almost 90% of the 1,039 people who responded to a poll Fidelity conducted said it would either be an “extremely easy” or “easy” thing to accomplish.

As the economy improved, 22% of Fidelity’s 401(k) investors actually increased their savings rate over the past year—by an average of 4 percentage points (that is, 4% of their pay).