Instructions to set up Taxes on a Category in RMS.
Overview
Taxes are allocated to a Category so they post automatically on the charges for that Category. Each tax you add can be calculated on the charge amount on its own, on the charge amount plus other taxes, or on the amount of another tax.
Please Note! RMS is highly configurable. Some Terminology, User Access & Permissions, Images, Labels, and Functions used in these articles may differ from your setup. CLICK HERE to find out more.
Guide
In the side menu of RMS, go to Setup > Category/Area.
-
Select Edit on an existing Category.
- Navigate to the Accounting tab.
- Select an Available Tax.
- Select Allocate to assign the Tax to the Category.
-
Select the Method to Calculate:
- Use Amount
- Use Amount + Previous Tax
- Use Amount + All Previous Taxes
- Based on Tax Amount From
- Use Amount + Tax Amount From
Where the Method to Calculate is Based on Tax Amount From or Use Amount + Tax Amount From, select the tax in the Based on column.
Where the Method to Calculate is Use Amount + Tax Amount From, select a Calculate Tax On option.
Repeat Steps 3 to 5 for each additional tax as required.
- Select the up or down arrow to set the Calculation Order.
-
Select Save/Exit.
Important! The examples in this article are for demonstration purposes only. Properties should consult their accountant for the specific legislative requirements on taxes for their business, prior to completing tax setup in RMS. See Tax Examples by Country for tax setup examples by country.
Tax Calculation Methods
Every tax allocated to a Category has a Method to Calculate. This determines which amounts are added together before the tax is calculated. The Calculation Order determines the order the taxes are calculated in, from the top of the list down.
| Method to Calculate | Amounts the tax is calculated on | Requires a Based on tax |
|---|---|---|
| Use Amount | The charge amount only. Other taxes are not included. | No |
| Use Amount + Previous Tax | The charge amount plus the tax directly above it. Taxes higher in the order are not included. Use this method when one tax is charged on top of another. | No |
| Use Amount + All Previous Taxes | The charge amount plus every tax above it, added together. | No |
| Based on Tax Amount From | The selected tax only. The charge amount is not included. | Yes |
| Use Amount + Tax Amount From | The charge amount plus one selected tax. The selected tax can sit anywhere in the Calculation Order. | Yes |
Please Note! The Based on and Calculate Tax On columns are named using the tax label configured for your property. On a property using the GST label they appear as Based on GST and Calculate GST On.
Important! The tax selected in the Based on column must be calculated before the tax that uses it. Use the Calculation Order to place it higher in the list. Where it sits lower in the list, the tax that uses it has no amount to calculate from and will not post correctly.
Examples of each Method to Calculate
The charge amount in these examples is 100.00. Three taxes are allocated to the Category in this Calculation Order:
- VAT 5%, set to Use Amount, which posts 5.00
- Tourist Tax set to Tax Flat Amount, which posts 1.75
- Municipality Tax 5.4%.
Only the Municipality Tax Method to Calculate changes in each row. For the tax types available when creating a tax, see Taxes - Tax Exclusive.
| Method to Calculate | Calculated | Municipality Tax posted |
|---|---|---|
| Use Amount | 100.00 charge amount | 5.4% of 100.00 = 5.40 |
| Use Amount + Previous Tax | 100.00 charge amount + 1.75 Tourist Tax. The VAT is not included because it is not directly above. |
5.4% of 101.75 = 5.49 |
| Use Amount + All Previous Taxes | 100.00 charge amount + 5.00 VAT + 1.75 Tourist Tax | 5.4% of 106.75 = 5.76 |
| Based on Tax Amount From, Based on VAT | The 5.00 VAT only. The charge amount is not included. |
5.4% of 5.00 = 0.27 |
| Use Amount + Tax Amount From, Based on VAT, Use Amount + Tax Amount Based On | 100.00 charge amount + 5.00 VAT | 5.4% of 105.00 = 5.67 |
| Use Amount + Tax Amount From, Based on VAT, Use Amount | 100.00 charge amount only. The VAT is not added because Calculate Tax On is set to Use Amount. |
5.4% of 100.00 = 5.40 |
Tip! Use Amount + Previous Tax and Use Amount + All Previous Taxes return the same result when only one tax is allocated above the tax being calculated. The difference appears with three or more taxes, as shown above.
Setup and result for each Method to Calculate
Each option below shows the Allocated panel on the Edit Category Accounting tab, then the charge as it posts on the reservation account. The VAT and the Tourist Tax stay on Use Amount throughout, so only the Municipality Tax row changes. N/A means the column is unavailable for that Method to Calculate. Long values are shortened on screen where the column is narrower than the text.
Use Amount
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Use Amount | N/A | N/A |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 5.40 |
Use Amount + Previous Tax
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Use Amount + Previous Tax | N/A | N/A |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 5.49 |
Use Amount + All Previous Taxes
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Use Amount + All Previous Taxes | N/A | N/A |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 5.76 |
Based on Tax Amount From
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Based on Tax Amount From | 5% VAT | N/A |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 0.27 |
Use Amount + Tax Amount From, with Calculate Tax On set to Use Amount + Tax Amount Based On
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Use Amount + Tax Amount From | 5% VAT | Use Amount + Tax Amount Based On |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 5.67 |
Calculate Tax On
A tax can be conditional, applying only when the amount falls within a set range. Selecting Use Amount + Tax Amount From makes the fourth column available: Calculate Tax On, shown as Calculate GST On or Calculate VAT On depending on your property's tax label. It allows the amount that decides whether the tax applies to differ from the amount the percentage is charged on.
Setting it to Use Amount + Tax Amount Based On, the default, charges the percentage on the charge amount plus the selected tax. That is the last option shown in the previous section, where the Municipality Tax posts 5.67. Setting it to Use Amount charges the percentage on the charge amount only, shown below. For conditional taxes and the other tax calculation options, see Taxes - Tax Exclusive.
Use Amount + Tax Amount From, with Calculate Tax On set to Use Amount
Setup on the Category
| Tax Description | Method to Calculate | Based on Tax | Calculate Tax On |
|---|---|---|---|
| 5% VAT - 5% | Use Amount | N/A | N/A |
| Tourist Tax - Per Night Flat Fee - 1.75 | Use Amount | N/A | N/A |
| Municipality 5.4% - 5.4% | Use Amount + Tax Amount From | 5% VAT | Use Amount |
Result on the reservation account
| Date | Description | Debit |
|---|---|---|
| 05 Aug 2026 | Accommodation | 100.00 |
| - 5% VAT | 5.00 | |
| - Tourist Tax - Per Night Flat Fee | 1.75 | |
| - Municipality 5.4% | 5.40 |
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