Include VAT in price with createInvoice

I want to include the VAT in the price of a line item.

My solution is to:

1. Set the price of the item to its actual price ($2990) divided by 1.06.

2. Add an object to the "taxes" array and set its rate to 6.

import { invoices } from 'wix-billing-backend';

export function create() {

    invoices.createInvoice({
        ...
        lineItems: [{
            id: '0',
            name: "Line Item",
            quantity: 1,
            price: 2990 / 1.06,
            taxes: [{
                name: "VAT",
                rate: 6,
                code "VAT"
            }]
        }]
    });

This works sometimes, with some prices. However, in this case, I get this error:

balance USD -0.01 must be non negative

How do I approach rounding in Velo and JS?