The Tesla Model 3 might be sealing headlines these days, but the Model S sedan and Model X SUV are still as popular as ever. That seems to be causing issues with Tesla’s order books and production process.

Tesla announced this week that both The Model S and X are backlogged and new orders will take between four and five months to fulfill. That’s a huge increase over the standard one-month wait time Tesla customers have recently grown accustomed to.

These wait time are apparently only for U.S. customers, however. Tesla’s California assembly plant is responsible for producing the world’s supply of Model S, X, and 3s. One theory proposed by electrek.com suggests Tesla is taking this time fulfill a backlog of orders from its global markets.

On the flip side, Tesla says current Tesla owners inside the U.S. can expect to receive their pre-ordered Model 3 within three weeks, skipping the long line of Model 3 pre-orders from would-be first-time Tesla owners.

However, things get worse when considering the U.S. government’s sun-setting of the $7,500 tax credit on EV vehicles slated for the next few months. That translates into the loss of Uncle Sam’s $7,500 tax rebate credit and a $7,500 more expensive EV.

While that might not be a big deal to those shelling out $100,000 for a loaded Model S or X, $7,500 is a decent percentage of the Model 3’s $35,000 starting price.

References

Read our full review on the 2017 Tesla Model S.

Read our full review on the 2017 Tesla Model X.

Read more Tesla news.