SINN Féin's income last year was almost £2.5 million – vastly outstripping other Stormont parties.
In total it received £2,495,054 during 2019, according to newly-released records from the Electoral Commission.
The figure is almost five times the income of the DUP, which had the second-largest sum of the northern parties with £499,957.
The huge amount can largely be attributed to Sinn Féin receiving £2m from the will of a reclusive English millionaire.
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Retired mechanic William E Hampton's political donation is considered the largest in the north's history.
Friends suggested the 82-year-old, who had no known links to Sinn Féin or Irish republicanism, bequeathed the record-breaking sum to hit back at the British establishment.
He had inherited money from his father who had extensive business interests in Fenstanton, Cambridgeshire.
Mr Hampton died in January 2018 in Wales where he was living in a nursing home. His ashes were later buried in a grave plot in west Belfast, in a ceremony attended by former Sinn Féin leader Gerry Adams.
Sinn Féin last year also significantly outspent the north's other parties with an expenditure of £1,536,119.
The DUP's expenditure was £487,904.
Alliance had an income of £388,644 and expenditure of £382,221, while the Ulster Unionists received £325,900 and spent £345,637.
The SDLP had an income of £145,835 and expenditure of £139,082.
Of the Stormont parties with an income or expenditure of more than £250,000, they reported almost £3,710,000 of income and £2,752,000 of expenditure last year.
This compares with £1,774,000 of income and £1,974,000 of expenditure in 2018.
Cahir Hughes, head of the Electoral Commission in Northern Ireland, said publishing the data was an "important part of delivering transparency in political finance" and "enhancing public confidence and trust in our democratic processes".
