Income at the National Trust for Scotland rose to £57.9m, its latest accounts show.
The figures for the year to 28 February, which were released last week, show an increase from the £56.8m recorded by the charity in 2017/18.
Expenditure also rose in 2018/19, from £59.7m to £62.9m, according to the accounts.
This meant that the total reserves at the end of the financial year covered by the accounts were £237.8m.
The NTS had 4.1 million visitors last year to its 97 properties and eight national nature reserves.
But the charity was hit with "teething problems" when introducing a suite of new cloud-based IT systems to modernise its financial and customer services processes, the accounts say.
In his introduction to the accounts, Simon Skinner, chief executive of the National Trust for Scotland, said the problems with the new system affected the charity’s ability to collect membership subscriptions and donations by direct debit.
It also affected the charity’s processing of supplier invoices, according to Skinner, and "alternative processes" had been put in place.
"Unfortunately these problems have taken longer to resolve than anticipated and the switch to the new system still has a way to go before outstanding problems are fully resolved," he said.
"We are endeavouring to pay outstanding monies as soon as possible and appreciate the support and understanding of our suppliers."
But a spokesman for the charity said that the problems with the IT system had had no impact on membership income, which rose from £11.9m to £12.2m in the latest accounts.