If you have noticed a bump in your paycheck lately, don’t fret. It’s not a mistake. The Department of the Treasury noted that 90% of American employees would see an increase in their take-home pay as employers reduce the federal tax withheld. The new rates were implemented mid February which means they have likely already gone into effect.

It’s hard to calculate exactly how the new tax law will affect your situation until next year, so it may be wise to save that extra bit of money at least until you file your 2018 tax return.

Keep in mind that there is a difference between what’s withheld from your pay and what you may actually owe in federal taxes. The latter requires completion of your tax return. If your tax payments are more than your tax liability, you’ll have a tax refund. If not, you’ll owe additional tax. And, although you may already see a difference on your paycheck, the new tax laws will not affect taxes filed this year.