UPDATE: We probably should have known better than to trust Jaffe to get the details of something involving the Post totally right. Instead, we’ll let the Washington Business Journal take it away: inside the Beltway, the daily paper will continue to cost 75 cents, while the Sunday paper will go up to $2. Outside the Beltway, the cost of the daily paper will increase to $1.

So sayeth Washingtonian’s Harry Jaffe, who reports that the Post has already notified retailers that the cost of a daily newspaper will increase 25 cents, to $1, on December 13. The price of the Sunday paper will also go up, it by 50 cents, to $2.50. See above for correct numbers.

It was only a couple of years ago that the newspaper announced the daily price would go up to 50 cents, citing declining circulation and advertising revenue. Those metrics have only looked worse for the paper since then, despite a slightly improved outlook for The Washington Post Co., which can largely be attributed to the continued success of Kaplan, Inc.

Still, as Jaffe is quick to point out, $1 is still less than other major U.S. dailies, notably The New York Times, which costs $2 during the week and $6 on Sundays. Will that extra 25 cents really cause you to rethink how often you purchase the dead tree version of the paper? Or did you long ago abandon it in favor of the web site, anyway?