The government's borrowing cost just ticked up. Here's what it does to your payment.

The rate the government pays to borrow money, the 10-year Treasury, rose a few notches on June 12, to 4.48%. Mortgage rates usually follow that number, so today's average rate is 6.375%. That's a hair higher than it was a few days ago. On a $500,000 loan, you're looking at about $3,090 a month. A week ago, that same loan would have been about $3,060. A $30 difference isn't huge, but it adds up over time.

The Fed meets in one day to decide whether to raise, lower, or leave rates alone. Markets get jumpy right before these meetings, and that can nudge mortgage rates around day to day. If you're close to making an offer, it's worth asking about locking your rate now instead of waiting to see what happens. Rates can move fast when the Fed talks, and you don't want to be caught chasing a number that got away from you.