A busy close-season of departures at the North West outfit saw the likes of Roque Santa Cruz, Matt Derbyshire and Stephen Warnock offloaded, in deals which netted Rovers in the region of £26million.
Sam Allardyce has been allocated just over half that amount to reinvest, which has led to reported disquiet amongst some supporters.
Williams said savings had to be made at the club with £12.5million of their transfer income being used to cover budgetary deficiencies.
The sacking of Paul Ince and his backroom staff and the appointment of Allardyce and his team plus a drop in the number of televised matches Blackburn were involved in led to a £7.5million hole in the budget, as the unplanned January arrivals of Gael Givet and El-Hadji Diouf pushed the annual wage bill to £46million.
Contingency payments"That is the gap that had to be plugged from the Santa Cruz deal," said Williams, who revealed the club received an initial fee of £15million for the Paraguay international with further cash coming from "contingency payments".
"For years we have stretched ourselves budgeting a league finish above that suggested by the wage bill.
"This year we took a more pragmatic approach to our mantra of break-even; a 13th-place finish would support circa £41million annual wage bill.
"Therefore we needed to get £5million off the wages. We have failed to do this."
Because of that failure other measures had to be taken so when Aston Villa bought Warnock for £7million just days before the transfer window closed, Allardyce was allowed only £2million to buy Pascal Chimbonda from Tottenham.
"Not surprisingly wages are running very similar year on year," Williams told the Lancashire Telegraph.
"So we have filled the resulting £5million hole with the difference in transfer fees between Stephen and Pascal.
"I'm not entirely comfortable about funding wages from transfer fees but developing players, buying low and selling high has, by necessity, become part of our business.
"I suppose the most sobering thing about this is that even if we stretch ourselves to achieve break-even at operating level that still leaves nothing for player acquisition. So trading is the name of the game."
Daunting taskNevertheless, Williams felt his club could still compete on the field.
"I do get depressed at times when I see the spending power of the clubs with big fan bases and/or wealthy owners putting in money," he said.
"But they're not better than us, they don't work any harder, they just have more money.
"Many of them I know look with envy at our achievements on and off the field over recent years.
"And they certainly don't have a greater ambition than us.
"My greatest fear is not that we haven't stretched ourselves enough, it's that we have stretched ourselves too far - but lack of finance is nothing to be ashamed of.
"We should in fact be proud to be supporting a big club in a small town. We deserve to be in this league, it's no fluke."