House Speaker John A. Boehner has offered to push any fight over the federal debt limit off for a year, a major concession that would deprive Republicans of leverage in the budget battle but is breathing new life into stalled talks over the year-end “fiscal cliff.”

The offer came Friday, according to people in both parties familiar with the talks, as part of the latest effort by Boehner (R-Ohio) to strike a deal with President Obama to replace more than $500 billion in painful deficit-reduction measures set to take effect in January…

Boehner’s offer also includes a proposal to raise tax rates for millionaires, generating $460 billion over the next decade — about half what Obama has demanded from the wealthy, according to official estimates…

But the tax offer was viewed as a breakthrough, the Democrat said.