A grandmother claimed £4,000 of benefits she was not entitled to when her husband returned to live with her.
Rosemary Dawson, 61, of Seattle Avenue, Bispham, pleaded guilty to four offences of failing to notify a change of circumstances.
She was given a 12-month conditional discharge and ordered to pay £50 costs by Blackpool magistrates.
Dawson was overpaid a total of £4,316 in employment support allowance, pension credits, housing and council tax benefits between June and November last year after she failed to disclose her husband Charles was living with her.
Robert Castle, defending, said his client was a retired woman of previous unblemished character.
Dawson had allowed her estranged husband to live at her home as he had financial difficulties. They had not lived as man and wife.
She had already paid back more than £2,000 of the money she owed.