Concerns have been raised about self-employed workers who are excluded from the self-employed income support scheme.
The scheme provides a cash grant to sole traders or partners who are experiencing disruption as a result of the UK's coronavirus epidemic.
It provides those eligible with up to 80% of their income, up to £2,500 a month, for an initial three-month period.
The Association of Taxation Technicians (ATT), however, warned that not all of the UK's five million self-employed population are covered.
People who registered as self-employed on or after 6 April 2019 have not yet filed a tax return, for example, and are therefore ineligible for a grant.
Likewise, self-employed workers with trading profits of more than £50,000 are excluded from the scheme.
Company owners who receive dividends don't qualify, although they may be eligible for the job retention scheme to cover up to 80% of salary.
Jeremy Coker, president at the ATT, said:
"While we appreciate the Government's priority has to be getting support to the largest number of people in the quickest manner possible, in the coming weeks we would like to see the Government find ways to help those in self-employment and owners of small companies - who will otherwise not qualify for appropriate and much needed support.