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The crooner's four firms are still boasting healthy bank accounts despite her being largely out of the limelight in recent years.
The 60-year-old rose to global fame after appearing on Britain's Got Talent in 2009.
She has not toured since 2014 and has made only a handful of appearances at one-off shows.
Records filed at Companies House show her main company, Duil Limited, has almost £1.2 million in the bank while her second firm, Speur Business, has assets worth £158,563.
Speur Films - set up amid plans for a Hollywood movie about her rise to fame - has £1,719. A fourth firm, Speur Limited, has assets of almost £131,000.
The figures are slightly down on the previous year when the total amount of cash in her businesses was almost £1.8 million.
Susan, from Blackburn, West Lothian, is director and the owner of all the shares in her companies, which handle income from her music, TV appearances, live performances and merchandising.
The amount in these accounts is thought to only be a fraction of her total earnings.
READ MORE: This is how Susan Boyle's life has changed almost 13 years on from becoming an overnight sensation
Nicknamed SuBo, Susan got her big break with her performance of I Dreamed A Dream on Britain's Got Talent.
She has since released eight albums and sold over 20 million records.
In 2009, she paid £65,000 to buy the three-bedroom former council house in Blackburn, where she grew up.
The following year, she bought a five-bedroom £300,000 new-build detached villa at the other end of the small town, which she calls The Posh House.
However, she couldn't settle there, and moved back home. She has said her only extravagances were a £300 fur coat and the occasional bottle of Chanel No 5 from duty free shops.
In an interview to mark her 60th birthday earlier this year, Susan said she planned to make a musical comeback once the coronavirus pandemic is over.
She said: "I'm definitely not retiring, that's for sure.
"Look at one of my idols Elaine Paige, she's 73 and still performing. I love what I do and want to keep doing it so long as the public enjoys it.
"I'm going to hang on for dear life to what I do."