Daisy May Cooper is "absolutely skint" after splurging her \'This Country\' income on candles and ASOS deliveries.
The 34-year-old actress claims she only has £150 in her bank account because she didn\'t previously realise she had to put money aside for tax.
She said: "We\'re absolutely f*****g skint at the moment.
"I\'ve got £150 in my bank. The problem was, when it happened, I didn\'t put any money aside and I absolutely spunked it up the wall on crap like candles and ASOS deliveries and then my husband was like, \'Where\'s the money aside for tax?\' and I was like, \'What money?\'
"And ever since then, I\'ve been having to pay it back!"
Daisy\'s brother and co-star Charlie Cooper believes the pair would be "rolling in it" if the show had come out when DVD sales were in their prime.
He said: "People see you on TV and they assume you\'re absolutely rolling in it.
"The thing is, we\'ve missed the boat on DVDs. If this was fifteen years ago, we\'d be f****g rolling in it!"
The pair\'s comedy show was commissioned by the BBC on the same day as \'Fleabag\' - following an ITV pilot which flopped - and the sitcom\'s creator Phoebe Waller-Bridge left BBC head of comedy Shane Allen\'s office just minutes before Daisy and Charlie met him.
She said: "When we went into our meeting, our first meeting at the BBC, Phoebe Waller-Bridge had just left and they commissioned Fleabag and This Country on the same day."
Speaking to The Sun newspaper, Charlie added: "I remember seeing she\'d left her pass. I didn\'t know who she was at the time. Now I\'m like, \'F*****g, f**k.
"I could\'ve sold that for fifty quid on eBay."
Daisy May recently revealed she and Charlie had £100-a-month cleaning jobs before \'This Country\'.
The sibling duo - who created and star as cousins Kerry and Lee \'Kurtan\' Mucklowe in the hit BBC Three comedy - struggled for money as they tried to find their big break, and they turned to comedy as a way of coping.
She said: "It was such a bleak time. I\'d just come out of drama school and thought it\'d be fine because I\'d get loads of auditions, and then didn\'t get anything.
"[I] had to move back in with my parents, and just do a night time cleaning job - I think we got paid about £100 a month, it was that bad.
"As we were going around cleaning, we just came up with these characters and said, \'Oh God, we\'ve gotta write something\'. Humour was the only thing getting us through because it was such a depressing time."
