Beginning April 1, 2017, ecommerce giant Amazon will collect tax on purchases delivered to destinations in New Mexico. Aside from the five states that don’t have a general sales tax — Alaska, Delaware, Montana, New Hampshire, and Oregon — New Mexico is currently one of only four states where Amazon does not collect tax. Now that list has shrunk to three: Hawaii, Idaho, and Maine. At the rate news is breaking, that could change by the time this post is complete.

Over the past few months, Amazon has voluntarily agreed to collect and remit in more than a dozen states. On March 1, it started collecting Arkansas, Oklahoma, and Wyoming tax. On Feb. 1, it was Mississippi, Missouri, Rhode Island, South Dakota, and Vermont. Four states announced that Amazon would collect as of Jan. 1: Iowa, Louisiana, Nebraska, and Utah. Alabama and the District of Columbia kicked off the trend in November and October, respectively.

The New Mexico announcement isn’t surprising; given Amazon’s recent actions, it seemed more a question of “when” than “if.” As in other states, officials in New Mexico seem pleased: Ben Cloutier, spokesman for the New Mexico Taxation and Revenue Department, expects Amazon to boost the state’s gross receipts tax revenue by tens of millions of dollars.

Neither company nor state officials have explained why Amazon has decided to collect New Mexico tax in April. Gov. Susana Martinez’s office referred the Albuquerque Journal to Cloutier for more information, and Cloutier wouldn’t comment on “whether the state and company forged some kind of agreement.” Yet Cloutier did note that Amazon sometimes opts to collect in states where it plans to expand, and he said he hopes that’s the case in his state: “That’s what we’re most excited about. The potential is there for more growth and not just the immediate revenue impact.”