Stick with a legitimate accountant and there will be NO MSC extra tax/ni bills as MSC legislation would not apply. Now the government are enforcing IR35 for medium and large companies, I think it will be the beginning of the death knell for agencies using Ltd co’s, instead they will only use PAYE in the fullness of time as it will be the agencies that will be heavily fined if they fall fowl of IR35 by using the services of a worker who should be employed via PAYE.