He said he started a remedial strategy, which included accountant and longtime friend Rodney De Terte, who suggested calling-in fees not previously billed on long-term projects as one way of rectifying the situation.
McKay said he was away from work sick when Mr De Terte came to his home the day before the investigation started, asked about McKay's preparation of the invoices and then waited while McKay dictated details for Mr De Terte to take back to the firm's office for filing.
Called by defence counsel Scott Jefferson as the only other defence witness, Mr De Terte said he was was approached by McKay in October 2009 when the firm's Interest in Trust account was in deficit by $900,000, and discussed right to call-in fees as one of the "first things to look at."
Asked by Crown prosecutor Chris Lange to confirm he was involved in "intensive" discussions with McKay regarding the problems, Mr De Terte said: "I don't know what you're referring to. I had one or two meetings, that was it. There wasn't much I could do there."
He said he saw McKay at home and asked if anything had been done about calling-in fees, but there hadn't.
Mr De Terte said he knew nothing about the invoices McKay said were dictated, and did not take recordings back to the firm for writing.
Prosecution and defence closing addresses will be given today.