The Government is warning it could face £4bn in extra pension costs under an amendment to the same sex marriage bill.
Former Conservative minister Tim Loughton has lodged an amendment to the bill to allow heterosexual people to enter into civil partnerships.
According to the Guardian, pensions minister Steve Webb has warned the change would leave the Government on the hook for between £3bn to £4bn in extra public service pension payments for survivors’ rights.
The extra cost is based on a judgement that more straight people would become civil partners and gain the same pension rights as married couples.
Labour has proposed its own amendment calling for a consultation on civil partnerships that would allow further debate on how to limit possible costs and delays.
It is urging MPs not to back Loughton’s amendment, which is widely seen as a way of wrecking the bill by causing extra costs and delays.
Loughton has hit out at the £4bn figure, saying it is a ”fag packet estimate” as straight couples may not want civil partnerships.