Osborne may be correct that a decision to quit the block will cause an economic shock that will have an impact on the Budget and force the Government to make adjustments. But the way to get that message across is with data advertising the benefits of membership, not by menacing the electorate.
The economic risks of Brexit have already been outlined by the IMF, OECD, the Treasury, the Bank of England, and other bodies who've studied the likely short- and medium-term economic impact, and it has been repeated to voters constantly throughout the campaign.
Voters are perfectly capable of drawing their own conclusions; Osborne's gambit suggests he doesn't think so.
Today's speech makes him look like schoolyard bully. It verges on undemocratic: "Vote the way we want you to or we'll take away more of your pay and we'll cut the public services you use".
It may well be the end of any hopes Osborne has of winning the Tory party leadership once Prime Minister David Cameron steps down. By contrast, his chief rivals for the post, Michael Gove and Boris Johnson, increasingly sound like winners, focusing on the positive steps they'd take after winning the referendum to disentangle Britain's EU relationship.
For those of us who'd prefer to remain part of the world's largest single market, the widespread accusation that the pro-Europe campaign has become "Project Fear" is worrying - and sadly predictable.