一、创业者是否需要开通税务的问题：
许多创业者可能会疑惑，我拿到了营业执照，是否要立即开通税务？实际上，根据国家规定，我们在拿到营业执照后的30天内需要前往税务局办理税务登记。工商税务已经联网，公司拖太长时间不开通税务容易被监察。
二、个体户和电商行业：
平时几乎用不到发票对于一些个体户或电商行业来说，他们平时都大多面向个人客户，因此开具发票的需求相对较少。相关部门目前对个体户的管控相对较松，因此很多个体户长时间不开通税务也没有人管。
三、开通税务并不意味着一定交税：
值得注意的是，开通税务并不意味着您一定要交很多税。申报和纳税是两个独立的事情。您可以根据公司的实际情况，通过成本抵扣、做亏损或零申报等方式降低税收负担。
四、小规模纳税人增值税优惠政策：
小规模全年开普票120万以内，季度开普票30万以内是免增值税的。因此，在税收方面，您无需过于担忧。
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Django change an existing field to foreign key
I have a Django model that used to look like this:class Car(models.Model): manufacturer_id = models.IntegerField()There is another model called Manufacturer that the id field refers to. However, I realized that it would be useful to use Django's built-in foreign key functionality, so I changed the model to this:class Car(models.Model): manufacturer = models.ForeignKey(Manufacturer)This change appears to work fine immediately, queries work without errors, but when I try to run migrations, Django outputs the following:- Remove field manufacturer_id from car - Add field manufacturer to carDoing this migration would clear all the existing relationships in the database, so I don't want to do that. I don't really want any migrations at all, since queries like Car.objects.get(manufacturer__name="Toyota") work fine. I would like a proper database foreign key constraint, but it's not a high priority.So my question is this: Is there a way to make a migration or something else that allows me to convert an existing field to a foreign key? I cannot use --fake since I need to reliably work across dev, prod, and my coworkers' computers.内容来源于 Stack Overflow, 遵循 CCBY-SA 4.0 许可协议进行翻译与使用。原文链接：Django change an existing field to foreign key
