Murrayfield chief executive Mark Dodson has also revealed that the governing body's year-end debt is down to £11.2m - the lowest figure in over a decade.
The SRU achieved a surplus of £900,000 in the year to April 30 while Scotland, Edinburgh and Glasgow were watched by crowds totalling more than 500,000 at venues including Murrayfield, Scotstoun and Pittodrie.
The details were made public as the SRU hosted its Annual General Meeting at Heriot-Watt University in Edinburgh.
Dodson said: "By attracting more supporters to our game we have encouraged further investment over the past 12 months, no mean feat in challenging financial times.
"We have welcomed a number of new sponsors, while commercial partnerships have been developed. We have also agreed the biggest single sponsorship deal in the history of Scottish Rugby, with our new kit partner, Macron."
Dodson also highlighted the improved performance of the national side during the RBS 6 Nations.
Interim head coach Scott Johnson led the side to joint third after beating both Italy and Ireland, helping to record the Scots' highest position for seven years.
Johnson is due to be replaced as head coach by Clermont Auvergne boss Vern Cotter next June.
Meanwhile, the SRU have secured extra sponsorship support after tying up deals with Caledonia Best, The Famous Grouse and Dove Men+Care.
- Sports & Recreation
- Mark Dodson