Local Booking Manager has centrally set VAT rate for reservations. VAT rate is located in Preferences > Reservation settings > Invoice (1.) in Tax rate (%) field (2.)
If you want to change the Tax rate from 10% to 13% for example, simply enter the new value of 13 (1.) and press Apply (2.)
All following reservations after you make the change will be calculated with the new tax rate.
NOTE: all reservations made prior to change will keep the previous tax rate and if required will have to be manually changed in the calculation in the Tax (%) field (1.) and pressing Apply (2.).