There are 2 ways:
1. in backend, edit your tax rate (please make sure you configured the country and currency, tax rate) and set the tax rate to 0.00001% for example. Also the shipping tax and other taxes (if have) will need set to that number.
So the price will nearest same your base price.
2. Edit /templates/ot_swatch/html/com_virtuemart/productdetails/default_showprices.php
and remove the comment ("//") at beginning of this line:
//echo $this->currency->createPriceDiv('priceWithoutTax', 'COM_VIRTUEMART_PRODUCT_SALESPRICE_WITHOUT_TAX', $this->product->prices);